22. Transistor Identification

Question.1

The PCB shown below contains several components.
The three-lead component highlighted in red has no visible part number and is labelled “Q” (e.g., Q1 or Q2) printed on the board.

Based on this standard labelling, what type of component is it?

They are high-speed Quartz crystals used for timing the clock.
They are transistors used for switching or amplification.
They are Quick-blow fuses designed to protect the board from surges.
They are Quality-check points used only during factory testing.

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