_______ tests to see if the mongo shell is connected to a mongos instance.

A)  sh.addShard()
B)  sh._lastMigration()
C)  sh._checkMongos()
D)  All of the above

Correct Answer :   sh._checkMongos()

Explanation : The sh._checkMongos() method throws an error message if the mongo shell is not connected to a mongos instance.

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