Which of the following is not true regarding the use of security doors as barriers?

Which of the following is not true regarding the use of security doors as barriers?
A . Locking hardware is an important aspect of door security.
B . The doorframe may be a weak point if not properly installed.
C . Door hinges may add to the weakness of a door if not properly installed.
D . The door is usually stronger than the surface into which it is set.
E . All of the above.

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Answer: D