Final answer:
Turning off the FLAP MODE on the GPWS panel causes the system to adjust for different flap configurations, without deactivating the warning system, changing the terrain database, or altering radio frequencies.
Step-by-step explanation:
When the FLAP MODE pushbutton is selected off on the GPWS panel, (C) the system adjusts for different flap configurations. The Ground Proximity Warning System (GPWS) typically alerts pilots if their aircraft is in immediate danger of flying into the ground or an obstacle. The GPWS includes various modes that consider different aspects of flight, including the configuration of the aircraft's flaps. When the FLAP MODE is turned off, it tells the system that the standard flap configurations for landing or takeoff are not being used, and therefore, the GPWS adjusts its warning criteria accordingly. This does not deactivate the warning system or change its terrain database or radio frequency.