Which protocol is seen as TCP/IP in writing?

The correct response highlights TCP as the protocol that embodies the principles of TCP/IP in written form. TCP, or Transmission Control Protocol, is a foundational component of the TCP/IP suite and is responsible for establishing reliable connections between hosts. It ensures that data is transmitted accurately and in the correct order through techniques such as error checking, acknowledgment of received packets, and retransmission of lost data.

While IP (Internet Protocol) handles addressing and routing packets across networks, it does not guarantee delivery, making TCP's reliability function crucial. UDP (User Datagram Protocol) is an alternative transport protocol that does not guarantee delivery or order, focusing instead on speed and simplicity. HTTP (Hypertext Transfer Protocol) operates at a higher layer, using TCP to transmit web content but not serving as a transport protocol itself.

Thus, TCP's role as a reliable transport layer protocol clearly identifies it as the protocol that reflects the trusted, connection-oriented characteristics of the TCP/IP framework in written documentation.