An administrator needs to install a 2U server into a rack. Which of the following shows how much space, in height, needs to be available for the server to fit in the rack?

1.75 inches (4.45 cm) represents the height of a 1U device, not a 2U device.

2.5 inches (6.35 cm) does not correspond to a standard multiple of a rack unit height.

A standard rack unit (1U) is defined as 1.75 inches (4.445 cm) in height. Therefore, a 2U server requires twice that amount of vertical space. Calculating 2 multiplied by 1.75 inches yields 3.5 inches (8.89 cm), which is the precise height needed for a 2U server to fit into a rack.

4.25 inches (10.8 cm) does not correspond to a standard multiple of a rack unit height, as 3U would be 5.25 inches.