A company wants to move its application to a serverless architecture. The solution must analyze existing and new data with SQL. The company stores the data in an Amazon S3 bucket. The data must be encrypted at rest and replicated to a different AWS Region. Which solution meets these requirements with the LEAST operational overhead?

The correct solution uses an S3 bucket with SSE-KMS multi-Region keys for encryption and CRR for replication, meeting the encryption and replication requirements. Amazon Athena is a serverless query service that allows SQL analysis directly on S3 data, fulfilling the serverless and SQL analysis needs with minimal operational overhead. Incorrect options: Using SSE-S3 instead of SSE-KMS multi-Region keys might not meet specific compliance requirements for key management or multi-Region key usage. Using Amazon RDS for querying S3 data is not a direct or serverless approach; RDS is a relational database service, not a query engine for S3 objects. Configuring CRR on an existing S3 bucket and then applying SSE-S3 might not ensure all existing data is encrypted with the desired key type without re-uploading. Using Amazon RDS for querying S3 data is inefficient and not serverless for this use case.