Discussion
A stage biased correctly at room temperature saturates when the equipment warms. Which fault fits?
Answer: D
Drift with temperature and only with temperature points at a bias arrangement that does not oppose the three thermal effects, so the current climbs until the device saturates. A capacitor fault would not be temperature selective in this way, and a wrong resistor value would misbias the stage from cold. That a symptom appears only under one condition is what identifies which mechanism is responsible.
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