Answer A - 1 VRRP over Ethernet. Over Ethernet, VRRP routers use a common MAC address of the format 00:00:5E: 00:01:XX. The first three octets are derived from the IANA's OUI. The next two octets (00:01) indicate the address block assigned to the VRRP protocol by IANA
0000.5E00.01xx is VRRP virtual MAC (Ans. A with xx=0A group)
0000.0c07.acxx is HSRP virtual MAC address (Ans. C with xx=99)
0007.b400.xxyy is GLBP virtual MAC (Not in the answers), xx is group and yy is AVF
I don't know what B and D are.
Here is a Tip to get rid of the confusion between HSRP and VRRP.
the second letters of both are HSRP:S and VRRP:R
in the alphabet the first letter that we find is R followed by S, so R comes before S, so does number 5 come before number 7.
VRRP is always associated to number 5 (R).
HSRP is always associated to number 7(S).
Virtual MAC address : A virtual MAC address is automatically generated by taking the last 8 bytes as the VRRP group number in hexadecimal. In VRRP, Mac address used is 0000.5e00.01xx. Here, xx is the VRRP group number in hexadecimal.
https://www.geeksforgeeks.org/introduction-of-virtual-router-redundancy-protocol-vrrp-and-its-configuration/
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