not C because :
"Lifecycle management – set rules to transfer objects between storage classes at defined time intervals."
and "S3 Intelligent-Tiering (automatically moves data to the most cost-effective tier)."
see in : https://digitalcloud.training/aws-storage-services/
but, in other hand, I can't find a webpage saying that dynamoBD is cheaper (even if bard is conviced that dynamodb is cheaper in this case)
B. Base the selection of Amazon EC2 instance types on past utilization patterns.
C. Use Amazon S3 Lifecycle policies to move objects that users access infrequently to lower-cost storage tiers.
from above link
"Right sizing is the process of matching instance types and sizes to your workload performance and capacity requirements at the lowest possible cost. It’s also the process of looking at deployed instances and identifying opportunities to eliminate or downsize without compromising capacity or other requirements, which results in lower costs."
"Right sizing is a key mechanism for optimizing AWS costs, but it is often ignored by organizations when they first move to the AWS Cloud. They lift and shift their environments and expect to right size later. Speed and performance are often prioritized over cost, which results in oversized instances and a lot of wasted spend on unused resources."
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