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AWS Certified Solutions Architect - Associate · AWS
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The question focuses on reducing initialization latency when launching large EC2 instances in an Auto Scaling group during sudden demand spikes. So B with fast snapshot is obviously the choice. But without the choices listed there, I would simply integrate a Warm Pool for the Auto Scaling group with pre-initialized instances based on an optimized AMI :)
The question wording is pretty weird but the only thing of value is latency during initialisation which makes B the correct option. https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ebs-fast-snapshot-restore.html A only helps with creating the AMI C and D will probably work (ambiguous language) but won't handle initialising latency issues.
Fast Snapshot Restore (FSR) • Force full initialization of snapshot to have no latency on the first use