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You are building an automated transcription service in which Amazon EC2 worker instances
process an uploaded audio file and generate a text file. You must store both of these files in
the same durable storage until the text file is retrieved. You do not know what the storage
capacity requirements are. Which storage option is both cost-efficient and scalable?

Multiple Amazon EBS volume with snapshots

A single Amazon Glacier vault

A single Amazon S3 bucket

Multiple instance stores

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