What action can a marketer take to quickly check profile ingestion in AEP?

Accessing monitoring through the Adobe Experience Platform (AEP) User Interface (UI) is the most effective action for a marketer to quickly check profile ingestion. The AEP UI provides real-time insights and monitoring capabilities that allow marketers to visualize and track the ingestion process of profiles efficiently. By using the monitoring features, marketers can see whether profiles are being ingested successfully and identify any issues that may arise during the process, enabling them to make informed decisions in a timely manner.

The other options suggest methods that may not offer the immediacy or user-friendliness required for quick checks. Running a manual ingestion report, for example, could provide the needed data but is likely to involve more steps and time than simply checking the real-time monitoring available in the UI. Data loss prevention tools focus on safeguarding data rather than providing insights into ingestion status. Contacting an engineer for updates could also delay the process, as it relies on another person's availability and doesn't provide immediate access to the necessary data. Therefore, using the AEP UI for monitoring stands out as the quickest and most efficient approach for marketers to verify profile ingestion.