An Installation Crew Is Pulling an Optical Fiber Cable into a Riser

An installation crew is pulling an optical fiber cable into a riser. The cable has an outside diameter of 25 mm (1 in) . As the cable is being pulled off the reel and through a pulley into the riser, you must verify that the minimum bend radius for the cable being pulled is observed. The pulley must be sized at a MINIMUM of:

A) 254 mm (10 in)
B) 381 mm (15 in)
C) 508 mm (20 in)
D) 635 mm (25 in)
E) 762 mm (30 in)