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Which of the following index would be optimum for the query?

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Which of the following index would be optimum for the query?

Select all valid. db.test.find( { a : 5, c : 2 })

A.

db.test.ensurelndex( { c:l, a: 1})

B.

db.test.ensurelndex( { a : 1, c: 1, d: 1, b : 1})

C.

CH db.test.ensurelndex( { a :1, c:l})

D.

db.test.ensurelndex( { a: 1, b :1, c:l, d:l})

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