What is true of the way that encryption works with EBS?

A.
Snapshotting an encrypted volume makes an encrypted snapshot; restoring an encrypted snapshot creates an encrypted volume
when specified / requested.

B.
Snapshotting an encrypted volume makes an encrypted snapshot when specified / requested; restoring an encrypted snapshot
creates an encrypted volume when specified / requested.

C.
Snapshotting an encrypted volume makes an encrypted snapshot; restoring an encrypted snapshot always creates an encrypted
volume.

D.
Snapshotting an encrypted volume makes an encrypted snapshot when specified / requested; restoring an encrypted snapshot always
creates an encrypted volume.

Explanation:
Snapshots that are taken from encrypted volumes are automatically encrypted. Volumes that are created from encrypted
snapshots are also automatically encrypted. Your encrypted volumes and any associated snapshots always remain
protected. For more information, see Amazon EBS Encryption.
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EBSEncryption.html