In the MongoDB shell, how can you tell if an index was used with a query? Options: A . &nbspdb.customers.find({lastName: ‘smith’}).explain() B . &nbspdb.customers.find({lastName: ‘smith’}).perf() C . &nbspdb.customers.find({lastName: ‘smith’}).plan()

In the MongoDB shell, how can you tell if an index was used with a query?

Question

In the MongoDB shell, how can you tell if an index was used with a query?

Options:

A . db.customers.find({lastName: ‘smith’}).explain()

B . db.customers.find({lastName: ‘smith’}).perf()

C . db.customers.find({lastName: ‘smith’}).plan()

Answer: Option A

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