which protocol must be permitted on the firewall?

A Layer 2 transparent firewall separates two OSPFv3 routers. For the two OSPFv3 routers
to form an adjacency, which protocol must be permitted on the firewall?

A.
IPv4 protocol 89

B.
UDP port 89

C.
IPv6 protocol 89

D.
TCP port 89

Explanation: