LSC validation is failing on a new SCCP IP phone you have just added to the Cisco Unified CallManager 5.0 cluster. No other IP phones are experiencing any problems with LSC validation.What can you do to help pinpoint the problem?

A.
View the SDI trace output.

B.
Check for security alarms.

C.
Use the security configuration menu on the IP phone to verify that an LSC has been downloaded to the IP phone.

D.
Verify that the authentication string is correct in the Cisco Unified CallManager device configuration screen.