According to CEH v13 Cloud Computing, backup integrity and resilience are critical components of cloud security. The 3-2-1 backup model is a widely recommended best practice to mitigate unauthorized access, data corruption, and ransomware-related incidents.

The 3-2-1 rule dictates that organizations should maintain:

3 copies of critical data

Stored on 2 different media types

With 1 copy stored offsite or offline

This approach ensures that even if one backup is compromised, altered, or deleted—as described in the scenario—clean and trusted versions of the data remain available for restoration. CEH v13 emphasizes that offline or immutable backups significantly reduce the impact of malicious modification.

Option A focuses on physical security, which does not protect cloud backups. Option B addresses availability, not integrity. Option C is relevant to web application security, not backup protection.

CEH v13 explicitly highlights backup segregation and redundancy as key countermeasures against cloud data compromise. Therefore, Option D is the most direct and effective mitigation strategy.