+In Order to Prevent the Accidental Introduction of a Virus

+In order to prevent the accidental introduction of a virus into your facility's local area network, your facility has a policy that strictly prohibits

A) doing personal work on the computer system, even during personal time.
B) sharing disks from one workstation to another within the facility.
C) downloading executable files from electronic bulletin boards.
D) sending or receiving e-mail from addresses that have not been authorized.