How should you install the PDUs to maximize power distribution and space efficiency?

You are installing HPE ProLiant servers into a rack that will be fully loaded. You also need to install four power distribution units (PDUs) in the rack.

How should you install the PDUs to maximize power distribution and space efficiency?
A . at the top of the rack with the cables running between the RETMA rails
B . horizontally on extension bars mounted directly to the frame for improved clearance
C . in the bottom bay of the rack with the outlets facing the front
D . vertically, side by side on both sides of the rack with the outlets facing the center

Answer: D