A. Use both server-side encryption with AWS KMS keys (SSE-KMS) and the Amazon S3 Encryption Client.
B. Use dual-layer server-side encryption with AWS KMS keys (DSSE-KMS).
C. Use server-side encryption with customer-provided keys (SSE-C) before files are uploaded.
D. Use server-side encryption with AWS KMS keys (SSE-KMS).

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