After a power failure of a datacenter rack, one of the physical servers did not automatically boot up. Which of the following should the technician use to boot the server remotely?

iLO is an out-of-band management controller embedded on HPE server motherboards that operates independently of the host OS and main power. It provides a dedicated management network interface allowing a technician to remotely power on a server, access a virtual console, and control hardware - all without requiring the OS to be running.

A KVM switch provides physical keyboard, video, and mouse access to a server but does not provide remote power-on capability - it only works once the server is already powered and displaying output.

SSH is an OS-level remote shell protocol that requires the server's operating system to be running and network stack to be active before a connection can be established.

RDP (Remote Desktop Protocol) is a graphical remote access protocol that requires the Windows OS to be fully booted and running before it can accept connections.