Which of the following are true regarding encrypted Amazon Elastic Block Store (EBS) volumes? (Choose two.)

A.
Supported on all Amazon EBS volume types

B.
Snapshots are automatically encrypted

C.
Available to all instance types

D.
Existing volumes can be encrypted

E.
shared volumes can be encrypted

Explanation:
This feature is supported on all Amazon EBS volume types (General Purpose (SSD), Provisioned IOPS (SSD),
and Magnetic). You can access encrypted Amazon EBS volumes the same way you access existing volumes;
encryption and decryption are handled transparently and they require no additional action from you, your
Amazon EC2 instance, or your application. Snapshots of encrypted Amazon EBS volumes are automatically
encrypted, and volumes that are created from encrypted Amazon EBS snapshots are also automatically
encrypted.

http://docs.aws.amazon.com/kms/latest/developerguide/services-ebs.html