An enterprise is designing a disaster recovery strategy for a critical application. The RTO is 4 hours and the RPO is 1 hour. The application uses EC2 instances and an RDS database. Which DR strategy is the MOST cost-effective while meeting the requirements?

Answer options:

Multi-site Active-Active

Warm Standby

Pilot Light

Backup and Restore

How to approach this question

Balance RTO/RPO requirements with cost.

Full Answer

C.Pilot Light✓ Correct

A Pilot Light strategy maintains a copy of core infrastructure (like databases) running in the DR region, while compute resources are only provisioned during a disaster. This is highly cost-effective and easily meets a 4-hour RTO.

Common mistakes

Choosing Warm Standby which costs more, or Backup/Restore which might miss the RTO.

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