The correct answer is Perform a detailed assessment of application usage and possible data exposure. This investigation should come first because it reveals what data is at risk and which users and apps are involved so the organization can prioritize responses and avoid unnecessary disruption.

A detailed assessment provides the evidence needed to take targeted actions. It lets you identify the apps that actually have access to sensitive data and the scope of exposure so you can plan measured responses such as targeted blocking, tailored access policies, or tuned data protection rules rather than applying blunt measures.

Cut off access to all identified high risk applications immediately is not the best opening move because an immediate blanket cutoff can disrupt critical business functions and may block legitimate services. You should confirm risk and impact before taking broad enforcement actions.

Enforce conditional access controls through Cloud Identity to restrict risky app access is a useful control but it depends on knowing which users and data to protect and how apps are used. Conditional access should be applied after the assessment so policies are accurate and do not cause excessive access problems.

Deploy Data Loss Prevention policies using Cloud DLP can reduce data exfiltration risk but DLP policies require careful tuning and testing to avoid false positives and to target the right data. DLP deployment is often a follow up remediation once you understand the exposure from the assessment.

Full AWS Practitioner Certification Question