Pete, the system administrator, is concerned about unauthorized access at all entrances into the building. PIN pad readers have been installed, but users have developed the habit of holding the door for others behind them. Which of the following would BEST prevent this?
A.
Install mantraps at every unmanned entrance.
B.
Replace the PIN pad readers with card readers.
C.
Implement video and audio surveillance equipment.
D.
Require users to sign conduct policies forbidding these actions.