YouworkasanExchangeAdministratorforXxx.ThecompanyhasaWindows2008ActiveDirectory-basednetwork.ThenetworkcontainsanExchangeServer2010organization.AnemployeenamedJohnhasrecentlyleftthecompany.YouneedtodeletethemailboxandtheuseraccountforJohn.YoualsoneedtoremovethemailboxfromtheExchangedatabase.WhichofthefollowingcommandswillyouenterintheExchangeManagementShelltoaccomplishthetask?()
A.Delete-Mailbox-Identityjohn@TK.com
B.Remove-Mailbox-Identityjohn@TK.com-Permanent$true
C.Remove-Mailbox-Identityjohn@TK.com
D.Disable-Mailboxjohn@TK.com