You work as the exchange administrator at TestKing.com. The TestKing.com network contains an Exchange Server 2010 Organization. TestKing.com has its headquarters in Stockholm where you are located.The TestKing.com network contains a database availability group （DAG）. You receive an instruction fromthe management to devise a Mailbox database security solution for the organization. Management wantsthe read/write performance to be maximized as well as ensuring that any access to the database isprohibited in the event of theft. What should you do？（）

A. You should recommend that management make use of DAG network encryption.
B. You should recommend that management make use of Encrypted File System （EFS）
C. You should recommend that management make use of Windows BitLocker Drive Encryption.
D. You should recommend that management make use of Rights Management Service RM