For a backbone distribution system serving a usable floor space of 8,920 m2 (96,000 ft2), the MINIMUM slot area to be used for this back bone is
A . 0.040 m2 (60 in2)
B. 0.048 m2 (72 in2)
C. 0.056 m2 (84 in2)
D. 0.064 m2 (96 in2)
Answer: B
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