The transport layer of the OSI framework provides a mechanism for the exchange of data between end systems. Examples of protocols that operate on the transport layer include: 

A.  IP and TCP
B.  IP and UDP
C.  TCP and UDP
D.  IP, TCP, and UDP

The three different protocols called out in our possible answer choices are, by definition:

1. IP Protocol: AKA, the internet protocol. This protocol exists on the network layer. It utilizes datagrams to communicate over packet switched networks.
2. TCP: AKA Transmission Control Protocol. This protocol exists on the transport layer. This protocol relies on the exchange of streams of data. It is known for reliability, implementing protocol timers and memory buffers to ensure no lost packets as well as synchronization of data.
3. UDP: AKA User Datagram Protocol. This protocol exists on the transport layer. It is known as a “best effort” protocol, as it maintains simplicity and therefore does not protect against lost packets and data duplication.

Out of the three protocols, only TCP and UDP operate on the transport layer, while IP operates on the network layer. Hence, C is our answer.