What are all the available methods relating to indexes in MongoDB?

The correct choice encompasses the key methods for managing indexes in MongoDB. The method createIndex() is essential for creating an index on a collection to improve query performance. This is a standard operation that allows developers to specify how the data should be indexed.

The dropIndex() method is vital for removing a specific index from a collection. This can help in scenarios where an index is no longer needed or if it is impacting performance negatively.

The presence of dropIndexes() is also crucial as it indicates a method to drop all indexes on a collection in one operation, which can be useful during data model changes or significant updates to the database schema.

Finally, getIndexes() (while the option stated it as getIndexes(), which may be considered a discrepancy in naming) provides the needed functionality to retrieve a list of indexes that currently exist on a specific collection. This helps developers and database administrators in assessing the current indexing strategy and making informed decisions about index management.

This choice includes methods that are practical and commonly used in database management for both creation and removal of indexes, alongside retrieving the index information, thus representing a comprehensive understanding of index manipulation in MongoDB. Other choices either introduce incorrect methods or do not include the complete and accurate set