MongoDB uses a _____ lock that allows concurrent read access to a database but exclusive write access to a single write operation.

A)  Writer
B)  Readers
C)  Readers-writer
D)  None of the above

Correct Answer :   Readers-writer

Explanation : Before version 2.2, this lock was implemented on a per-mongod basis. Since version 2.2, the lock has been implemented at the database level.

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