Elance Exams Answers PDF file

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Which statement of the followings could NOT drop an index?

db.runCommand({dropIndexes:'foo', index : '*'})
db.collection.dropIndex({x: 1, y: -1})
db.runCommand({dropIndexes:'foo', index : {y:1}})
db.myCollection.reIndex()
db.collection.dropIndexes();
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