How do you know if no data is available for a report?

The correct option indicates that you would receive a specific error message stating that no data is available. This clear communication directly informs you that the system has processed your request but found nothing to report. This is significant because an error message serves as an effective alert for users, helping you understand that the absence of data is recognized by the system.

Error messages are designed to give explicit feedback on operational outcomes, unlike other options that might provide less clarity about the situation. For instance, while an email notification could suggest an issue, it may not directly confirm the data absence. Similarly, if there is no report generated, it could imply a variety of issues or failures in the reporting process, not exclusively that no data is available. A blank report without details might initially seem to indicate a lack of data, but it does not provide the direct confirmation that an error message does, leaving ambiguity about underlying issues. Therefore, receiving an error message is the most straightforward way to confirm the absence of data for a report.