You work as the enterprise exchange administrator at Company.com.The Company.com network consists of a single Active Directory domain named Company.com.Company.com has an Exchange Server 2010 organization.the Company.com contains an exchange server 2010 server named -ex10 that has imap4 installed.The users of .com use imap4 via the internet to connect to -ex10.you have received instructions from the cio to make sure that the can use -ex10 to connect to the internet.What should you do？（）

• A、you should consider running the test-imapconnectivity cmdlet from -ex10.
• B、You should consider using Telnet to connect to TCP port 587 from a client computer.
• C、You should consider using Telnet to connect to TCP port 143 from a client computer.
• D、you should consider running the test-outlookconnectivity cmdlet from -ex10.