Jack Walks Back to His Desk and Tries to Log

Multiple Choice

Jack walks back to his desk and tries to log on to his computer. He receives a message that states he needs to contact his administrator because his account is locked. What could have been the probable cause?

A) An intruder has tried logging on to his system. On successive failed attempts, the account lockout policy has locked his PC.
B) The entire network is down.
C) He has left some application open on his computer, which has locked the system.
D) He needs to continue to try logging on. Eventually the system will allow him to log in.