Which of the following are not reasons to use TFTP?

a. Upgrading or archiving the configuration files.
b. Save and reload the configuration files to and from a remote server.
c. Updating and saving the Internetwork Operating System (IOS) files.
d. All the above are reasons.

d. All the above are reasons.
Explanation: Trivial File Transfer Protocol (TFTP) is a simple file transfer protocol often used with routers and switches to save and reload the configuration files to and from a remote server. The files are saved in case of equipment failure, for rebooting, or for upgrading or archiving the configuration files. The TFTP server is also used for updating and saving the Internetwork Operating System (IOS) files stored in flash.