Which of the following is an example of a MAC address?

Which of the following is an example of a MAC address?

A.
192.17.2.1

B.
http://www.comptia.org

C.
00-00-00-1B-02-55

D.
4309:FD21:ACB3:0012

Explanation:

http://www.webopedia.com/TERM/M/MAC_address.html