The information technology system (ITS) designer should design conduits entering a building from below grade point to extend ________ above finished floor (AFF).

The information technology system (ITS) designer should design conduits entering a building from below grade point to extend ________ above finished floor (AFF).
A . 51 mm (2 in)
B . 100 mm (4 in)
C . 152 mm (6 in)
D . 203 mm (8 in)
E . 254 mm (10 in)

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Answer: B