You work as the exchange administrator at TestKing.com. The TestKing.com network contains an Exchange Server 2010 Organization. You are responsible for managing the Exchange network forTestKing.com. All servers on the TestKing.com network are configured to run Exchange Server 2010.At present the network is separated from the Internet by means of a firewall. You receive an instructionform management to ensure that customers from the Internet to use Outlook Anywhere， Outlook Web App（OWA）， Exchange ActivSync as well as IMAP4 over Secure Sockets Layer （SSL）. You thus need todetermine the TCP ports that you need to open. What should you do？（）

• A、You should consider opening port 25， port 80， port 143 as well as port 3269.
• B、You should consider opening port 25， port 443 as well as port 993.
• C、You should consider opening port 80， port 143， port 443 as well as port 389.
• D、You should consider opening port 26， port 443 as well as port 995.