Final answer:
The connection-oriented protocol among the given options is TCP, which ensures ordered and reliable delivery of data packets over the internet.
Step-by-step explanation:
The question is asking to identify a connection-oriented protocol from the given options. A connection-oriented protocol is one that establishes a connection before transmitting data and ensures that all packets of data arrive at the destination in the correct order and without errors. Among the options given, TCP (Transmission Control Protocol) is a connection-oriented protocol. It guarantees the delivery of data packets on the Internet in the same order they were sent, with error-checking and flow control.
FTP (File Transfer Protocol) and POP3 (Post Office Protocol version 3) both use TCP as their underlying transport layer protocol, which means they also work on a connection-oriented basis. However, UDP (User Datagram Protocol) is not connection-oriented; it is a connectionless protocol, which sends packets called datagrams without establishing a connection or guaranteeing delivery.
Therefore, the correct answer is c. TCP.