Which of the following is a valid MAC address format?1.0 MarksAB:F1:1B:FE:12:D1:65:91AA:AA:12:34::AA:AAAG:CA:1F:AA:11:DAAB:12:12:CA:1F

The valid MAC address format from the options given is AB:F1:1B:FE:12:D1.

A MAC address is a unique identifier assigned to network interfaces for communications on the physical network segment. It is a 48-bit number (12 hexadecimal digits). It is usually written as six pairs of two hexadecimal digits separated by colons (:), like AB:F1:1B:FE:12:D1.

The other options are not valid MAC addresses because:

• 65:91AA:AA:12:34::AA:AA has more than 12 hexadecimal digits and uses double colons (::).
• AG:CA:1F:AA:11:DA is invalid because 'G' is not a valid hexadecimal digit. Hexadecimal digits only include 0-9 and A-F.
• AB:12:12:CA:1F is invalid because it only has 10 hexadecimal digits, not 12.