A multinational law firm suffered a sophisticated malware attack that encrypted critical legal documents.

Comprehensive and Detailed Explanation (ECIH-aligned):

The ECIH Risk Assessment and Recovery module stresses that recovery must not reintroduce threats. When backups may be compromised, validating their integrity is critical.

Option A is correct because scanning backups with updated signatures and heuristic analysis ensures that latent malware is detected before restoration. ECIH emphasizes that restoring infected backups can trigger reinfection and negate eradication efforts.

Option D is excessive and disruptive. Option B is a containment control, not a recovery safeguard. Option C risks reintroducing compromised data.

Therefore, validating backups before restoration is the priority recovery action.