You have an Exchange Server 2010 organization.  Your network is separated from the Internet by a firewall.  You need to identify the ports that must be opened on the firewall to allow clients from the Internet to usethe following connections methods：.Outlook Anywhere .Outlook Web App （OWA） .Exchange ActiveSync .IMAP4 over Secure Sockets Layer （SSL） Which TCP ports should you identify？（）

• A、25， 443 and 993
• B、26， 443 and 995
• C、25， 80， 143， and 3269
• D、80， 143， 443， and 389