What can the administrator do to confirm this suspicion?
Enable Amazon S3 inventory and then query the inventory to identify the total storage of previous object versions.
Use object-level cost allocation tags to identify the total storage of previous object versions.
Enable the Amazon S3 analytics feature for the bucket to identify the total storage of previous object versions.
Use Amazon CloudWatch storage metrics for the S3 bucket to identify the total storage of previous object versions.
Explanations:
Enabling Amazon S3 inventory allows the administrator to generate a list of all objects in a bucket, including older versions. By querying the inventory, the administrator can check the storage usage for previous object versions and confirm the suspicion about the spike in storage costs.
Object-level cost allocation tags are used for tracking costs associated with specific objects but do not provide detailed information about previous versions of objects. This would not help identify storage costs for older versions.
Amazon S3 analytics is primarily designed for analyzing storage access patterns, not for tracking specific storage usage of previous versions. It does not offer the ability to identify storage usage for older versions of objects directly.
CloudWatch storage metrics provide data on the overall usage of an S3 bucket but do not break down the storage usage for specific versions of objects. This would not allow identification of storage associated with older versions.
I value that the answer is:
Enable Amazon S3 inventory and then query the inventory to identify the total storage of previous object versions.