A computer sales department promised customers: The computers sold by this department will be replaced within one month, repaired within one year free of charge, and free of labor fees for three years for door-to-door service, except for malfunctions caused by improper use.
Which of the following describes the services that the sales department should provide?
A man  bought a computer, and the keyboard failed one year later and asked the sales department to replace it with a new keyboard at half price.