What is a valid HSRP virtual MAC address?

What is a valid HSRP virtual MAC address?
A . 0000.5E00.01A3
B . 0007.B400.AE01
C . 0000.0C07.AC15
D . 0007.5E00.B301

Answer: C

Explanation:

Hot Standby Router Protocol Features and Functionality

http://www.cisco.com/en/US/tech/tk648/tk362/technologies_tech_note09186a0080094a91.shtml

HSRP Addressing

In most cases when you configure routers to be part of an HSRP group, they listen for the HSRP MAC address for that group as well as their own burned-in MAC address. The exception is routers whose Ethernet controllers only recognize a single MAC address (for example, the Lance controller on the Cisco 2500 and Cisco 4500 routers). These routers use the HSRP MAC address when they are the Active router, and their burned-in address when they are not.

HSRP uses the following MAC address on all media except Token Ring: