As a general rule, between the perimeter barrier and structures within the protected area, except when a building is a part of the perimeter barrier, there should be a clear zone of at least:

As a general rule, between the perimeter barrier and structures within the protected area, except when a building is a part of the perimeter barrier, there should be a clear zone of at least:
A . 10 feet
B . 20 feet
C . 30 feet
D . 40 feet
E . 50 feet

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Answer: E