Final answer:
The valid MAC address from the options provided is O 00:00:0c:11:cf:12, as it adheres to the standard six groups of two hexadecimal digits format. Therefore, the correct answer is option 3)
Step-by-step explanation:
The question is asking to identify a valid MAC address from the given choices. A MAC address is a unique identifier assigned to network interfaces for communications on the physical network segment. The standard format for printing MAC-48 addresses in human-friendly form is six groups of two hexadecimal digits, separated by hyphens or colons.
Looking at the options provided:
- O 00:00:0c:11:cg:12 - Invalid because 'g' is not a hexadecimal character.
- O 00:00:0j:11:cf: 12:00 - Invalid because 'j' is not a hexadecimal character, and it has an extra pair of digits.
- O 00:00:0c:11:cf:12 - Valid MAC address, follows the correct format and all characters are hexadecimal.
- O 00:00:0c:h1:cf: 99:01:cf - Invalid because 'h' is not a hexadecimal character and it has too many pairs of digits, making it an incorrect format for a MAC address.
Therefore, the valid MAC address from the options given is O 00:00:0c:11:cf:12.