How does a GLBP cluster respond to a host ARP request for the virtual IP address?
A. The AVG responds by using one of the virtual MAC addresses.
B. The highest priority AVF responds by using its own hardware MAC address.
C. The least utilized router responds by using its own virtual MAC address.
D. The AVG responds by using its own hardware MAC address.
A is correct.
The AVG is responsible for answering Address Resolution Protocol (ARP) requests for the virtual IP address. Load sharing is achieved by the AVG replying to the ARP requests with different virtual MAC addresses.
https://www.cisco.com/en/US/docs/ios/12_2t/12_2t15/feature/guide/ft_glbp.html