A company wishes to prevent unauthorized employee access to the data center. Which of the following is the MOST secure way to meet this goal?

A.
Use Motion detectors to signal security whenever anyone entered the center

B.
Mount CCTV cameras inside the center to monitor people as they enter

C.
Install mantraps at every entrance to the data center in conjunction with their badges

D.
Place biometric readers at the entrances to verify employees’ identity