What does the Server-side encryption provide in Amazon S3?
Server-side encryption doesn’t exist for Amazon S3, but only for Amazon EC2.
Server-side encryption protects data at rest using Amazon S3-managed encryption keys (SSE-S3).
Server-side encryption provides an encrypted virtual disk in the cloud.
Server-side encryption allows to upload files using an SSL endpoint for a secure transfer.
Explanations:
Server-side encryption exists for Amazon S3, not just for EC2. It protects data stored in S3, not EC2 instances.
Server-side encryption in S3 protects data at rest by using either Amazon S3-managed encryption keys (SSE-S3), AWS Key Management Service (KMS), or a customer-provided key.
Server-side encryption does not provide an encrypted virtual disk; that description refers to something like EBS (Elastic Block Store) or EC2 instance storage.
SSL endpoints are used for secure data transfer, but they are not part of server-side encryption, which specifically handles the encryption of data at rest.
I weigh that the answer is:
Server-side encryption protects data at rest using Amazon S3-managed encryption keys (SSE-S3).