You are working on the design of a new, large ER/TR that will contain many racks and data cabinets including a large UPS

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You are working on the design of a new, large ER/TR that will contain many racks and data cabinets including a large UPS system. Your recommendation to the architect for room access from inside the building is:

A. Two 0.9 m (3 ft) solid doors
B. One 1.5 m (5 ft) metallic roll top door
C. One 1.2 m (4 ft) solid core, steel sheath door
D. One 1.83 m (6 ft) solid core dual direction sliding door with removable sides
E. One double door with a removable center post