Which protocols are correctly described as relying on other protocols for functionality?

The choice indicating that HTTP relies on TCP/IP is correct because HTTP (Hypertext Transfer Protocol) is an application layer protocol used primarily for transmitting documents and web content over the internet. For HTTP to function, it relies on the underlying protocols of TCP (Transmission Control Protocol) and IP (Internet Protocol), which are part of the suite defining how data is transmitted across networks.

TCP provides a reliable channel, ensuring that data packets are delivered in order and without errors. IP is responsible for addressing and routing packets across network boundaries. In this way, HTTP's ability to transmit web pages and communicate between client and server depends fundamentally on the successful operations of TCP and IP.

In contrast, the other options misrepresent the relationships between the protocols. Awareness of these distinctions is vital, as understanding how various protocols interact helps clarify the overall structure and functioning of network communications.