Final answer:
Change streams in MongoDB allow access to all stages of the aggregation framework, enabling real-time data processing.
Step-by-step explanation:
The statement that when using change streams, all stages of the aggregation framework are available is True. In MongoDB, change streams provide a way to monitor the data changes happening in a collection or a database. By using change streams, you can capture the changes as they happen and perform various stages of the aggregation framework to analyze and manipulate the data.
For example, you can use filters, projections, grouping, sorting, and other stages of the aggregation framework to process and transform the change events received from change streams. This enables you to build powerful real-time data processing pipelines and react to changes in your data in a flexible and efficient manner.