The underlying client-server protocol has changed in version _______ of ZooKeeper.

A)  2.0.0
B)  3.0.0
C)  4.0.0
D)  6.0.0

Correct Answer :   3.0.0

Explanation : Old pre-3.0.0 clients are not guaranteed to operate against upgraded 3.0.0 servers and vice-versa.

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