What is a valid HSRP virtual MAC address?

A.
0000.5E00.01A3

B.
0007.B400.AE01

C.
0000.0C07.AC15

D.
0007.5E00.B301

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: 0000.0c07.ac** (where ** is the HSRP group number)