You are employed as the Exchange administrator at Company.com.The Company.com network contains an Exchange 2010 Organization.Company.com has its headquarters in Stockholm where you are located.The organization contains a database availability group named kingdag.kingdag in turns contains four mailbox servers as well as a server named -ex05.during routine monitoring you discover that -ex05 has failed.You receive an instruction from management to perform a recovery installation of -ex05 as well as making the restored server a member of kingdag.to ensure productivity you need to make sure that the mailbox box databases remain available in the event of a single server failure. What should you do？（）

A. you should consider having the computer account for -ex05 removed from the active directory
B. you should consider running the clean-mailboxdatabase cmdlet on all kingdag members except -ex05
C. you should consider having -ex05 removed from kingdag
D. You should consider having all mailbox database copies removed from KINGDAG