Which of the following disaster recovery deployment mechanisms has the highest downtime?

Answer options:

A.Pilot light
B.Warm standby
C.Multi-Site
D.Backup and Restore

Answer – D
The below snapshot from the AWS Documentation shows the spectrum of the Disaster recovery methods. If you go to the further end of the spectrum you have the least time for downtime for the users.
 In most traditional environments, data is backed up to tape and sent off-site regularly. If you use this method, it can take a long time to restore your system in the event of a disruption or disaster.
https://d1.awsstatic.com/whitepapers/aws-disaster-recovery.pdf
For more information on Disaster recovery techniques, please refer to the below URL:
https://aws.amazon.com/blogs/aws/new-whitepaper-use-aws-for-disaster-recovery/