What is a major difference between NFSv3 and NFSv4.x?

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What is a major difference between NFSv3 and NFSv4.x?
A . NFSv4.x is stateful, and NFSv3 is stateless.
B . NFSv4.x requires an auxiliary protocol for status monitoring, and NFSv3 does not.
C . NFSv4.x is stateless, and NFSv3 is stateful.
D . NFSv4.x requires an auxiliary protocol for mounting, and NFSv3 does not.

Answer: B