Explanation:

When you initiate the Collect Investigation Package action on a device in Microsoft Defender for Endpoint, the package includes many forensic artifacts that help you trace file usage, process execution, and system behavior. Among those artifacts are prefetch files. Prefetch files record metadata about which executables were run and when, and can provide first/last execution timestamps. Whizlabs+2InfoSec Write-ups+2 Specifically, Microsoft documents (e.g. Respond-machine alerts) describe that the investigation package contains folders such as Autoruns, Processes, Scheduled tasks, Security event log, Users and Groups, Prefetch files, among others. InfoSec Write-ups+2Whizlabs+2 Among those, the Prefetch files are the best source to determine the first and last run time of a given executable (like File1.exe). Other artifacts (process history, event logs) might also show execution events, but prefetch is the artifact designed for showing executable run metadata and is most commonly used for that purpose in forensic investigations. InfoSec Write-ups+2ExamTopics+2 Because the question specifically asks "first and last time File1.exe was executed," reviewing Prefetch files in the investigation package is the correct approach.

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Explanation/Reference:
https://docs.microsoft.com/en-us/cloud-app-security/anomaly-detection-policy

Reference:
https://techcommunity.microsoft.com/t5/azure-security-center/suppression-rules-for-azure-security-center-alerts-are-now/ba-p/1404920