When designing cable tray pathways under an access floor, what is the MINIMUM free space that should exist between the top of the cable tray side rails and the underside of the stringers?

When designing cable tray pathways under an access floor, what is the MINIMUM free space that should exist between the top of the cable tray side rails and the underside of the stringers?
A . 25 mm (1 in)
B . 51 mm (2 in)
C . 71 mm (3 in)
D . 101.60 mm (4 in)

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Answer: B