Whenever a user`s machine is turned on, a black screen appears prompting the user for an administrative password. The technician has no such password on file for this machine. Which of the following steps should the technician take to resolve this issue? 

Answer options:

A. Press and hold the CPU power button for five seconds, and then power back on.
B. Disconnect and reconnect the internal hard drive.
C. Remove the CMOS battery and reinsert it after ten seconds.
D. Remove the motherboard and place it back into the machine after ten minutes.

C