What is the purpose of the HPE Rack Air Duct Kit?

A.
It directs hot exhaust air from the rear of the rack to air returns in the floor

B.
It directs hot exhaust air from the front of the rack to air returns in the floor

C.
It directs hot exhaust air from the rear of the rack to air returns in the ceiling

D.
It directs hot exhaust air from the front of the rack to air returns in the ceiling