Based on RFC 4890, what is the ICMP type and code that should never be dropped by the firewall
to allow PMTUD?

A.
ICMPv6 Type 1 – Code 0 – no route to host

B.
ICMPv6 Type 1 – Code 1 – communication with destination administratively prohibited

C.
ICMPv6 Type 2 – Code 0 – packet too big

D.
ICMPv6 Type 3 – Code 1 – fragment reassembly time exceeded

E.
ICMPv6 Type 128 – Code 0 – echo request

F.
ICMPv6 Type 129 – Code 0 – echo reply

Explanation: