What is the first 24 bits in a MAC address called?

A.
NIC

B.
BIA

C.
OUI

D.
VAI

Explanation:
An Organizationally Unique Identifier (OUI) is a 24-bit number that uniquely identifies a
vendor, manufacturer, or other organization globally or worldwide.
They are used as the first 24 nits of the MAC address to uniquely identify a particular piece
of equipment.