In the hardware address 0000.0c07.ac0a, what does 07.ac represent?

A.
vendor code

B.
HSRP group number

C.
HSRP router number

D.
HSRP well-known physical MAC address

E.
HSRP well-known virtual MAC address

Explanation:
HSRP code (HSRP well-known virtual MAC address) – The fact that the MAC address is for an
HSRP virtual router is indicated in the next two bytes of the address. The HSRP code is always
07.ac. The HSRP protocol uses a virtual MAC address, which always contains the 07.ac numerical
value.
Reference: Cisco Hot Standby Router Protocol (HSRP)
(http://tools.ietf.org/html/rfc2281#page-13)