A user currently running Windows 7 has a printer installed, and confirms it is working correctly. Another user running Windows 7 is attempting to install the same driver but is getting an error.
Which of the following is the MOST likely cause?

A.
The printer is unable to share drivers with multiple clients.

B.
The connection speed is running at half-duplex.

C.
One PC is running Windows 7 Professional.

D.
One PC is running a 64-bit OS.