Which scenario involves using a data page effectively in a flow?

Using a data page effectively in a flow is closely associated with gathering parameters before invoking a connector. Data pages serve as a centralized means of accessing data within Pega applications, allowing for the retrieval and manipulation of data efficiently.

In this scenario, when gathering parameters, a data page can be used to pre-load the necessary data that is required for invoking a connector, such as credentials, URLs, or other relevant information. This helps to ensure that when the connector is called, it has all the required parameters readily available, streamlining the process and reducing the potential for errors or missing information.

The other scenarios, while involving data management, do not leverage the capabilities of a data page in the same effective manner. Modifying application data through an activity may deal with data in a more procedural way, while showing user notifications is related to user experience rather than data retrieval or manipulation. Storing results for reports does involve data, but typically that would be managed through report definitions or database operations rather than through the use of a data page in the flow context. Therefore, the first scenario clearly exemplifies the effective use of a data page in facilitating seamless data access needed for connecting to external systems.