22. Transistor Identification

Question.4

Look at the PCB image of a relay driver circuit controlled by a microcontroller.
The SOT-23 package component highlighted in red is placed between the microcontroller and the relay.

What is this component?

Dual diode used for signal protection
Small-signal transistor used to drive the relay
Linear voltage regulator for the relay supply
Ferrite bead for noise filtering

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