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Given a collection posts as shown below having a document array comments, which of the...

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Given a collection posts as shown below having a document array comments, which of the following command will create an index on the comment author descending?

A.

db.posts.createIndex({commerits.$.author " :-l});

B.

db.posts.createIndex({comments.$.author " : {$desc:l > });

C.

db.posts.createIndex({comments.author " :-l});

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