Answer:
TFTP Server
Step-by-step explanation:
For security reasons, an administrator of a network would save an operating system installation file in a TFTP server, from which operating system installer can be run on any end device in the network with a copy of the installation file from server.
All files from the network are saved to this server, so when the copy of the operating system in the network is corrupted, reformatting can be done still through the pre booth execution.