Paolo is experiencing an issue with a VoIP application on his MacBook Pro with OS X Mountain Lion installed. He can’t access Contacts from within the application,
so he can’t call his friend’s mobile phone. Which would be the first troubleshooting step to perform?

A.
Delete then reinstall the VoIP application.

B.
Open the Disk Utility, choose the startup disk and repair disk permissions.

C.
Delete the application’s preferences from /Users/Paolo/Library/Preferences.

D.
Check that Paolo granted the VoIP application access to Contacts under System Preferences > Security & Privacy > Privacy.