A 90-cm-diameter flat black disk is placed in the center of the top surface of a 1-m × 1-m × 1-m black box. The view factor from the entire interior surface of the box to the interior surface of the disk is
(a) 0.07
(b) 0.13
(c) 0.26
(d) 0.32
(e) 0.50
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