Which of the following interfaces cannot be used to perform a factory reset of a Cisco C-series codec?

A.
the onscreen menu interface

B.
the serial interface

C.
the touch interface

D.
the web interface

Explanation:
The on-screen menu interface cannot be used to perform a factory reset of a Cisco C-series codec. You might
want to perform a factory reset if there is a severe problem with the video system. If possible, you should back
up log files and the current configuration before proceeding with a factory reset.
To perform a factory reset by using the touch interface, you should open the Settings menu and navigate toAdministrator > Reset. After providing the proper user name and password, you should tap the Factory Reset
button. The system will revert to the default factory settings and restart.
To perform a factory reset by using the web interface, you should navigate to Maintenance > System Recovery
and select the Factory Reset tab. Click the red Yes button to proceed with the reset. The system will revert to
the default factory settings and restart.
To perform a factory reset by using the serial interface, connect a serial cable to the video system’s COM port.
You should use the following parameters to connect to the system by default:
Data bits: 8
Parity: None
Stop bits: 1
Flow control: None
Baud rate: 38400 bps
After you have logged in as admin, you should issue the xCommand SystemUnit FactoryReset Confirm: Yes
command. The system will display the following text:
*r FactoryResetResult:
** end
OK
Alternatively, if you can log in as root, you should issue the following commands:
rm /mnt/base/active/config.db –
reboot
Using either method, the system will revert to the default factory settings and restart.

Cisco: Cisco TelePresence System Codec C40/C60 and Profiles using C40/C60, Administrator guide: Factory
resetting the codec (PDF)