What is a risk associated with attempting to control physical access to sensitive areas such as computer rooms using card keys or locks? 
A、Unauthorized individuals wait for controlled doors to open and walk in behind those authorized. 
B、The contingency plan for the organization cannot effectively test controlled access practices. 
C、Access cards, keys and pads can be easily duplicated allowing easy compromise of the control. 
D、Removing access for those who are no longer authorized is complex.