Technician

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Technician A says a defective thermostat will cause the engine to operate at too cold of a temperature. Technician B says that there are various reasons for an engine to operate at too cold of a temperature. Who is correct?
Airflow through a typical HVAC system is being discussed. Technician A says that the temperature is controlled by blending airflow through the evaporator and heater core. Technician B says that outside air is used in all heating and cooling positions. Who is correct?
Technician A says that the airflow default setting in vehicles is defrost, because seeing out the windshield is most important. Technician B says that failure for air to flow through any but the defrost vents is likely caused by a vacuum problem. Who is correct?
The ambient temperature is 70° and the humidity is low. With the AC on, what should the high-side gauge pressure be?