单项选择题
A datacenter director implements a new security measure in response to multiple equipment thefts from the datacenter. The new security measure requires people entering or leaving the data center to go through an extra secure area. Once entering the area people must present two forms of authentication to leave. Which of the following security measures does this describe？（）
A.Mantrap
B.RFID cards
C.Defense in depth
D.Biometrics
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