An engineer is notified that the Cisco TelePresence MX800 that is registered in Cisco Unified Communications Manager shows an empty panel, and the Touch 10 shows a corresponding icon with no action when pressed. Where does the engineer go to remove the inactive custom panel?

A. The Software Upgrades page in CUCM OS Administration B. The In-Room Control Editor on the webpage of the MX800 Most Voted C. The phone configuration page in CUCM Administration D. The SIP Trunk Security Profile page in CUCM Administration