What Does the Server-Side Encryption Provide in Amazon S3

Multiple Choice

What does the Server-side encryption provide in Amazon S3?

A) Server-side encryption doesn't exist for Amazon S3, but only for Amazon EC2.
B) Server-side encryption protects data at rest using Amazon S3-managed encryption keys (SSE-S3) .
C) Server-side encryption provides an encrypted virtual disk in the cloud.
D) Server-side encryption allows to upload files using an SSL endpoint for a secure transfer.