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All other instances, secondaries, apply operations from the _________ so that they have the same data set.

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All other instances, secondaries, apply operations from the _________ so that they have the same data set.

(a) center

(b) secondary

(c) primary

(d) none of the mentioned

The question was asked in a national level competition.

I'm obligated to ask this question of Replication in MongoDB topic in portion Replication Concepts, Processes and Replication Set of MongoDB

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Best answer
Correct choice is (c) primary

To explain I would say: The primary accepts all write operations from clients.

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