Answer: Warm standby

## Explanation Warm standby has the lowest downtime among the listed disaster recovery deployment mechanisms. ### Disaster Recovery Spectrum: - **Backup Restore**: Highest downtime - involves restoring from backups after a disaster occurs - **Pilot Light**: Moderate downtime - core infrastructure is running but needs scaling up - **Warm Standby**: Lowest downtime - minimal infrastructure is always running and ready to scale - **DevOps**: Not a disaster recovery mechanism - refers to development operations practices ### Key Points: - Warm standby maintains a scaled-down version of the environment that can be quickly scaled up during a disaster - This approach provides faster recovery times compared to pilot light or backup restore methods - The AWS documentation shows that warm standby is at the end of the spectrum with the least downtime for users For more information on AWS disaster recovery techniques, refer to: https://aws.amazon.com/blogs/aws/new-whitepaper-use-aws-for-disaster-recovery/

Author: Ritesh Yadav