Which protocol would you use to upload files to a web server?

To upload files to a web server, the most appropriate protocol to use is FTP, which stands for File Transfer Protocol. FTP is specifically designed for transferring files between a client and a server over a network. It allows users to upload, download, and manage files on a remote server efficiently. This protocol supports authentication, which enhances security during file transfers.

While HTTP (Hypertext Transfer Protocol) can be used for uploading files in some applications, it is primarily designed for transferring web pages and application data. As such, using HTTP for file uploads can be less effective and is not the primary intended use of the protocol.

DHCP (Dynamic Host Configuration Protocol) is unrelated to file transfer. Its purpose is to assign IP addresses and other network configuration parameters dynamically to devices on a network, its function revolves more around network connectivity and management.

Telnet is a protocol used to provide a command-line interface for communication with a remote device or server. It is primarily for remote administration and management, not for file transfer.

Thus, among the options listed, FTP is explicitly tailored for the task of uploading files to a web server, making it the correct choice.