26. Transistor Reliability

Question.1

Alex is mounting a power transistor on a shared metal heatsink.
After powering the circuit, the system fails immediately, or multiple channels short together unexpectedly.

What is the reason for this failure?

The heatsink is absorbing too much heat
The metal tab of the transistor is electrically shorted through the heatsink
The transistor current rating is too high
The PCB copper thickness is insufficient

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