An administrator is configuring a new Linux server and wants to boot the system to a file that was previously downloaded to locally install removable media. Which of the following boot options should

PXE (Preboot Execution Environment) boots a system over the network by fetching an image from a TFTP or DHCP server, not from locally attached removable media.

The ISO boot option allows the system firmware to boot directly from an ISO 9660 image file stored on removable media such as a USB drive or DVD. Because the administrator downloaded the file locally and placed it on physical media, ISO is the correct selection - it does not require any network connectivity and reads the bootable image directly from the attached device.

NFS (Network File System) is a network-based file sharing protocol used to mount remote filesystems and does not support booting from a locally stored file on removable media.

HTTP boot retrieves boot images from a remote web server over the network and cannot boot from a locally downloaded file on removable media.