Multi-choice problem: Continue writing the next sentence in this paragraph:

How to use a glue gun 
Consult the owner's manual. 
Go over the owner's manual for information about safely operating your glue gun. Take note of the different components of the glue gun and how they're supposed to function.

Choices:
 -- It is always best to check the manufacturer's instructions for each components and work with one to get an idea of how to operate the glue gun properly. If your model is something like lvl, a glue gun may have a manual that includes safety information.
 -- If you're not sure about the model, you may want to explore the topics available on the manufacturer's website or ask the owner if they offer any warnings. Refer to the diagram of the glue gun before purchasing it for detailed information about how to operate it.
 -- The instruction manual should be able to tell you whether your glue gun will begin heating up automatically or needs to be turned on and off, how long it typically takes to warm up, and what materials it's recommended for. Be sure to read through the safety warnings carefully to reduce the risk of accident or injury while using the glue gun.
 -- Should it come loose or malfunction, speak to a customer service representative who will set the parts to work-in a safe way. Some small items that are closely related or work differently may not need to be inventoried and set aside.
The instruction manual should be able to tell you whether your glue gun will begin heating up automatically or needs to be turned on and off, how long it typically takes to warm up, and what materials it's recommended for. Be sure to read through the safety warnings carefully to reduce the risk of accident or injury while using the glue gun.