What is the proper term to refer to a single unit of TCP data at the transport layer?

A.
TCP segment

B.
TCP datagram

C.
TCP frame

D.
TCP packet

Explanation:

The data package created at the transport layer, which encapsulates the Application layer message is
called a segment if it comes from TCP/IP.” Pg. 27 Pg. 55 Casad: Sams Teach Yourself TCP/IP in 24 hrs.