A.Number of documents that match the query condition

B.Number of documents scanned

C.Number of index entries scanned

D.Details the completed execution of the winning plan as a tree of stages

A.All of the above

B.Compound Indexes

C.Geospatial Indexes

D.Multikey Indexes

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

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

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

A.1024 bytes and unlimited indexes

B.12 mega bytes and 64 indexes

C.64 bytes and 1024 indexes

D.1024 bytes and 64 indexes