You work as the exchange administrator at company.com.the company.com network contains an exchange server 2010 organization.you are responsible for managing the exchange network for company.com.the company.com network contains two mailbox servers named -ex01 and -ex02 as well as a mailbox database named -ex03.-ex01 and -ex02 are members of a database availability group named tkdag and contain a copy of -ex03.during the course of the week you receive an instruction from the cio to remove the -ex03 mailbox database from -ex01.what should you do？（）

A. your best option would be to use the exchange management console （emc） and then select the remove option on a right-click of the -ex03 database copy on -ex01.
B. your best option would be to run clean-mail box database -identity -ex03 on the exchange management shell.
C. your best option would be to use the exchange management console （emc） and then select the manage database availability group membership on a right-click on tkdag then you can remove -ex01 from the list.
D. your best option would be to run remove-mail box database -identity -ex03\-ex01 from the exchange management shell.