What does the "authoritative" flag in the show ip nhrp command output indicate?

A.
It indicates that information was learned from the source mapping information of an NHRP resolution request received by the local router or from an NHRP resolution packet being forwarded through the local router.

B.
It indicates an NHRP mapping entry for networks local to this router for which this router has answered an NHRP resolution request

C.
It indicates that the NHRP information was obtained from the next-hop server or router that maintains the NBMA-to-IP address mapping for a particular destination

D.
It indicates that this NHRP mapping entry must be unique; it cannot be overwritten with a mapping entry that has the same IP address but a different NBMA address.