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Which of the field is reserved for use as a primary key?

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Which of the field is reserved for use as a primary key?

(a) _id

(b) _uid

(c) _uuid

(d) All of the mentioned

I have been asked this question in an online quiz.

My question is taken from ObjectId in portion GridFS, BSON Datatype and Administration Concepts of MongoDB

1 Answer

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Best answer
Correct answer is (a) _id

Easiest explanation: ID value value must be unique in the collection, is immutable, and may be of any type other than an array.

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