Which statement about OSPFv3 is true?

A.
OSPFv3 runs on per subnet basis instead of per-link.

B.
OSPFv3 instance ID is only locally significant.

C.
OSPFv3 authentication is performed using the authentication field in the OSPFv3 packet
header.

D.
OSPFv3 neighbor discovery messages can be sourced only from link-local addresses.