Which RAS message is used between two gatekeepers to resolve an alias address?

Which RAS message is used between two gatekeepers to resolve an alias address?
A . GRQ
B . ARQ
C . IRQ
D . LRQ
E . RRQ

Answer: D

Explanation:

LRQ – These messages are exchanged between gatekeepers and are used for inter-zone (remote zone) calls. For example, gatekeeper A receives an ARQ from a local zone gateway requesting call admission for a remote zone device. Gatekeeper A then sends an LRQ message to gatekeeper B. Gatekeeper B replies to the LRQ message with either a Location Confirm (LCF) or Location Reject (LRJ) message, which depends on whether it is configured to admit or reject the inter-zone call request and whether the requested resource is registered.