A Media Access Control (MAC) address refers to a number that uniquely identifies a device on a network and is usually made up of ______ bits.

A MAC address is usually made up of 48 bits.

16 bits (A) is far too short for a unique device identifier.

32 bits (B) is the length of an IPv4 address, not a MAC address.

128 bits (D) is the length of an IPv6 address.

The 48-bit MAC address is written as twelve hexadecimal digits.

Its first 24 bits form the manufacturer's OUI.