In Amazon DynamoDB, what does the query operation allow you to do?

The query operation in Amazon DynamoDB is a powerful feature that allows you to retrieve items from a table efficiently by specifying parameters that narrow down the results. When you perform a query in DynamoDB, you can retrieve items based on the primary key, which is fundamental to the table's design. This capability is essential because it enables you to access data quickly and accurately.

Additionally, the query operation supports filtering items based on criteria you define. This means you can apply conditions to the attributes of the items to retrieve only those that meet your specific needs, providing more control over the data you work with.

Another vital aspect of the query operation is the ability to retrieve items based on an index. DynamoDB supports both primary key and secondary index queries, which allows users to optimize their data retrieval based on various access patterns without changing the underlying data structure.

Because the query operation encompasses retrieving items based on primary key, filtering items by specific criteria, and interacting with indexes, the correct choice reflects its comprehensive functionality, indicating that all of the aforementioned capabilities are indeed part of the query operation. This versatility makes the query operation a key tool for developers working with Amazon DynamoDB.