You work as the enterprise exchange administrator at Xxx .The Xxx network consists of forest with a site. The Xxx network has two Exchange Server 2010 Client Access servers named XXX-EX14 and XXX-EX15 that has IMAP4 installed.Remote users from the internet currently make use of IMAP4 to connect to XXX-EX14 and XXX-EX15.What actions must you take to block IMAP4 access to the mailboxes on XXX-EX15？（）

A. You must implement Outlook Protection Rules.
B. You must implement Transport Protection Rules.
C. You must set up a Public Folder Management Console.
D. You must deselect the IMAP4 mailbox feature in XXX-EX15.