A server administrator wants to work on the servers without removing them from the rack. Which of the following is the administrator MOST likely to need?

A server rail kit mounts inside the rack and provides sliding rails that allow the server to be extended forward out of the rack while still physically attached and often still powered. This gives the administrator physical access to the server's interior - for component replacement or inspection - without the effort and risk of fully removing the server from the rack.

A management module such as an iDRAC or iLO provides remote management and console access but does not physically enable hands-on hardware work on the server in the rack.

A redundant PSU provides power redundancy and fault tolerance but has nothing to do with physical access to the server in a rack.

Cable management arms organize and route cables at the rear of the rack and are a complement to rail kits, but they do not themselves enable hands-on access to the server chassis.