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Addding the index {a:l} can potentially decrease the speed of which of the following operations?

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Addding the index {a:l} can potentially decrease the speed of which of the following operations? Check all that apply.

A.

db.collection.update({b:456 > , {$inc: {a:l > })

B.

db.collection.find( {a : 232} )

C.

db.collection.insert( { a:341})

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