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For an EC2-based application, identify the most operationally efficient DR solution with an RTO under 4 hours and minimal AWS resource use in normal operations.
A
AMI creation for EC2 backup, AMI replication to a secondary Region, and automated deployment with AWS Lambda and scripts.
B
AMI creation for EC2 backup, AMI replication to a secondary Region, and automated deployment with AWS CloudFormation.
C
EC2 instance launch in a secondary Region with continuous activity.
D
EC2 instance launch in a secondary AZ with continuous activity.
