Which of the following could a security administrator implement to mitigate the risk of tailgating for a large organization?
A. Train employees on correct data disposal techniques and enforce policies.
B. Only allow employees to enter or leave through one door at specified times of the day.
C. Only allow employees to go on break one at a time and post security guards 24/7 at each entrance.
D. Train employees on risks associated with social engineering attacks and enforce policies.