Which of the below mentioned statements is true with respect to the AWS Glacier data security?

A company wants to review the security requirements of Glacier.

Which of the below mentioned statements is true with respect to the AWS Glacier data security?
A . All data stored on Glacier is protected with AES-256 serverside encryption.
B . All data stored on Glacier is protected with AES-128 serverside encryption.
C . The user can set the serverside encryption flag to encrypt the data stored on Glacier.
D . The data stored on Glacier is not encrypted by default.

Answer: A

Explanation:

For Amazon Web Services, all the data stored on Amazon Glacier is protected using server side encryption. AWS generates separate unique encryption keys for each Amazon Glacier archive, and encrypts it using AES-256. The encryption key then encrypts itself using AES-256 with a master key that is stored in a secure location.

Reference: http://media.amazonwebservices.com/AWS_Security_Best_Practices.pdf