What is used to uniquely identify a host on a TCP/IP network?

A.
IP address

B.
MAC address

C.
bit pattern

D.
router name

Explanation:
Section Reference: Configuring Internet Protocol
An IP address is the cornerstone of networking because it defines the computer or host you are working on.
Today, every computer and many other devices have such an address. An IP address allows each computer to
send and receive information in an orderly and efficient manner.