A and C
I bow to your superior knowledge. However having spent 3 years as a controller in D&D I can assure you that dialed through codes do set off alarms in D&D and they do appear on the aircraft in emergency D&D display. You can chose to dismiss my first hand knowledge as myth if you wish but those with older transponders with rotary adjustment will continue to cause false alarms at D&D if they do not select standby when dialling through the 7500 7600 7700 codes.
Moli