Select all true statements about auto bucketing feature in Aggregation Framework. ($bucketAuto stage)

Suppose you have a products collection with an index: { product_category: 1 } For which of the following queries can MongoDB look at only a subset of the index entries, rather than all of the index entries?

You have to create a simple configuration file for mongod instance. Here are the requirements of your mongod instance: * stores data files in /var/mongo/db * listens to connection from localhost * runs on port 27000 * uses authentication Which of the following configuration file meet these requirements?

How to connect to mongod instance and authenticate as root?

Which of the following roles provides the same read-only privileges as read role on all databases except local and config?