You Are Working on the Design of a New, Large

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