B. Base the selection of Amazon EC2 instance types on past utilization patterns and C. Use Amazon S3 Lifecycle policies to move objects that users access infrequently to lower-cost storage tiers.
This one is hard. I think it could be A, B and C. if the current workload demands for NoSQL capabilities are better suited for DynamoDB and the existing RDS resources are underutilized, migrating to DynamoDB can be a form of rightsizing. This migration aligns the resources more closely with the actual needs of the workload, potentially resulting in cost savings compared to maintaining underutilized RDS instances.
B is more an up front decision in the design phase, so A and C may be better answers here.
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.
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