Which method is used for inserting a single document in MongoDB?

In MongoDB, the method used for inserting a single document is .insertOne(). This method is part of the MongoDB driver and is specifically designed for inserting one document into a collection at a time. It takes a document as its argument and adds it to the specified collection, ensuring that the operation is atomic.

The use of .insertOne() allows for clean and easily understandable code, as it clearly conveys the intention of inserting a single data entry. The method also provides feedback regarding the success or failure of the insertion, which is helpful for error handling.

The other choices do not correspond to standard MongoDB methods for inserting documents. .insertSingle(), .addDocument(), and .createDocument() are not recognized methods in the MongoDB API, making them invalid options for this operation. Each of these terms might suggest their purpose, but they do not exist as functions that can be applied within MongoDB's framework. Thus, .insertOne() stands out as the correct and standardized approach to insert a single document.