Which is the last line of defense in a physical security sense?

Which is the last line of defense in a physical security sense?
A .  people
B .  interior barriers
C .  exterior barriers
D .  perimeter barriers

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Answer: A

Explanation: "Ultimately, people are the last line of defense for your company’s assets" (Pastore & Dulaney, 2006, p. 529). Pastore, M. and Dulaney, E. (2006). CompTIA Security+ study guide: Exam SY0-101. Indianapolis, IN: Sybex.