Which of the following characteristics of protective lighting is incorrect?

Which of the following characteristics of protective lighting is incorrect?
A . It may be unnecessary where the perimeter fence is protected by a central alarm system.
B . It usually requires less intensity than working light.
C . It may also provide personal protection by reducing advantages of concealment.
D . It should only be used as a psychological deterrent.
E . Such lighting is expensive to maintain.

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Answer: E