Company.com has employed you as their exchange administrator.The Company.com network contains an exchange server 2010 organization that hosts two exchange servers named -ex01 and -ex02.-ex01 and -ex02 is members of a database availability group.during the course of the day you decide to shut down -ex01.You then receive numerous complaints from users stating that they are unable to access their mailboxes.to ensure productivity you need to make sure that all examways users are able to connect to their mailboxes in the event of one mailbox server becoming inaccessible.What should you do？（）

A. your best choice would be to have the hub transport server role removed from -ex01.
B. your best option would be to have the mailbox database copies added to -ex01 and -ex02.
C. Your best option would be to have the shadow redundancy settings configured.
D. Your best option would be to have Client Access server array created.