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What is the coherency of replicated data?

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What is the coherency of replicated data?

(a) All replicas are identical at all times

(b) Replicas are perceived as identical only at some points in time

(c) Users always read the most recent data in the replicas

(d) All of the mentioned

This question was addressed to me by my school teacher while I was bunking the class.

This interesting question is from Distributed File System topic in division Distributed File Systems of Operating System

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Correct answer is (d) All of the mentioned

Explanation: None.

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