The following command was issued on a router that is being configured as the active HSRP router.
standby ip 10.2.1.1

Which statement about this command is true?

A.
This command will not work because the HSRP group information is missing.

B.
The HSRP MAC address will be 0000.0c07.ac00.

C.
The HSRP MAC address will be 0000.0c07.ac01.

D.
The HSRP MAC address will be 0000.070c.ac11.

E.
This command will not work because the active parameter is missing.

Explanation:
The full syntax of the command above is:
standby [group-number] ip [ip-address [secondary]]
Therefore in the command “standby ip 10.2.1.1″ we recognize it is using the default groupnumber, which is 0 -> The last two-digit hex value of HSRP MAC address should be “00″.