Information:  - A mobile network operator or MNO , also known as a wireless service provider , wireless carrier , cellular company , or mobile network carrier , is a provider of services wireless communications that owns or controls all the elements necessary to sell and deliver services to an end user including radio spectrum allocation , wireless network infrastructure , back haul infrastructure , billing , customer care , provisioning computer systems and marketing and repair organizations . In addition to obtaining revenue by offering retail services under its own brand , an MNO may also sell access to network services at wholesale rates to mobile virtual network operators . A key defining characteristic of a mobile network operator is that an MNO must own or control access to a radio spectrum license from a regulatory or government entity . A second key defining characteristic of an MNO is that an MNO must own or control the elements of the network infrastructure necessary to provide services to subscribers over the licensed spectrum . A mobile network operator typically also has the necessary provisioning , billing and customer care computer systems and the marketing , customer care and engineering organizations needed to sell , deliver and bill for services , however , an MNO can outsource any of these systems or functions and still be considered a mobile network operator .  - In telecommunication, provisioning involves the process of preparing and equipping a network to allow it to provide (new) services to its users. In National Security/Emergency Preparedness telecommunications services, ""provisioning"" equates to ""initiation"" and includes altering the state of an existing priority service or capability.  - Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Radio waves have frequencies as high as 300 GHz to as low as 3 kHz, though some definitions describe waves above 1 or 3 GHz as microwaves, or include waves of any lower frequency. At 300 GHz, the corresponding wavelength is , and at 3 kHz is . Like all other electromagnetic waves, they travel at the speed of light. Naturally occurring radio waves are generated by lightning, or by astronomical objects.   - The International Telecommunication Union (ITU), originally the International Telegraph Union, is a specialized agency of the United Nations (UN) that is responsible for issues that concern information and communication technologies.  - The electromagnetic spectrum is the collective term for all known frequencies and their linked wavelengths of the known photons (electromagnetic radiation). The "electromagnetic spectrum" "of an object" has a different meaning, and is instead the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object.  - A wireless network is any type of computer network that uses wireless data connections for connecting network nodes  - Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width. When radio waves strike an electrical conductor, the oscillating fields induce an alternating current in the conductor. The information in the waves can be extracted and transformed back into its original form.  - A computer network or data network is a telecommunications network which allows nodes to share resources. In computer networks, networked computing devices exchange data with each other using a data link. The connections between nodes are established using either cable media or wireless media. The best-known computer network is the Internet.  - The radio spectrum is the part of the electromagnetic spectrum from 3 Hz to 3000 GHz (3 THz). Electromagnetic waves in this frequency range, called radio waves, are extremely widely used in modern technology, particularly in telecommunication. To prevent interference between different users, the generation and transmission of radio waves is strictly regulated by national laws, coordinated by an international body, the International Telecommunication Union (ITU).    After reading the paragraphs above, we are interested in knowing the entity with which 'mobile network operator' exhibits the relationship of 'industry'. Find the answer from the choices below.  Choices: - computer  - distribution  - radio  - service  - telecommunication
A:
telecommunication