When troubleshooting an MWI issue in Cisco Unity Connection, which task should you perform in the phone system component at the beginning of troubleshooting?

A.	Ensure that MWI is enabled for the user.
B.	Ensure that the user has the correct phone system assigned.
C.	Run the Check Telephony Integration test.
D.	Ensure that the ports are configured for MWI only.
E.	Ensure that the pilot number matches the Cisco Unified Communications Manager configured pilot number.