The correct answer is: C. Primary corona wire
The primary corona wire is a thin wire that is located in the laser printer’s imaging drum. It is responsible for creating a negative charge on the drum, which attracts toner particles. If the primary corona wire is exposed to sunlight, the UV rays will cause it to degrade and eventually break. This will result in poor print quality and may even cause the printer to stop working altogether.
The other options are not as susceptible to damage from sunlight. The transfer corona assembly is a metal plate that is located near the imaging drum. It is responsible for transferring the toner from the drum to the paper. The PC drum is a cylindrical photoreceptor that is coated with a photoconductive material. The toner cartridge is a container that holds the toner powder. None of these components are as critical to the laser printing process as the primary corona wire, and they are not as likely to be damaged by sunlight.
In conclusion, the primary corona wire is the part of the laser printer that should not be exposed to sunlight. If it is exposed to sunlight, the UV rays will cause it to degrade and eventually break. This will result in poor print quality and may even cause the printer to stop working altogether.