If the network is experiencing reliability issues, what is the most likely reason?

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An IPv6 network has different MTUs on different segments.

If the network is experiencing reliability issues, what is the most likely reason?
A . The MTU size is greater than 1470 bytes
B . ICMPv6 is filtered.
C . HSRPv6 is configured incorrectly
D . The Do Not Fragment bit is marked.

Answer: B