MongoDB's Replication can be in Master-Slave form or _______ form.

When Storing large files in MongoDB one is encouraged to use...

Which of the following atomic operations would you use to add a value to an array only if it does not already exist in the array?

Authentication in MongoDB is:

What's the difference between `save()` and `insert()` in mongo shell?

MongoDB can have indexes on Array Elements?

From the MongoDB shell, how do you create a new document in the customers collection?

You want to modify an existing index. What is the best way to do this?

You have a collection of thousands of students. You'd like to return the second set of 20 documents from the sorted collection. What is the proper order in which to apply the operations?

On a newly created collection, which field will have an index?

. In an MongoDB mapReduce command, the reduce function should _.