A technician needs to install six blade servers. Which of the following MUST a technician install along with the blades?

Rail kits are used for rack-mounting traditional 1U/2U servers, not blade systems, which mount inside an enclosure rather than directly on rack rails.

Blade shelves are not a standard hardware component in blade server architecture; this term does not describe a required or common blade infrastructure element.

A blade enclosure is a chassis that houses multiple blade servers and provides them with shared resources including power supplies, cooling fans, network switches, and a management module. Blades are not standalone units and have no independent power or I/O connectors outside of the enclosure. Installing blades without an enclosure is physically impossible.

A blade station is not a recognized component in blade server infrastructure; this is a fabricated term that does not correspond to any required hardware.