16. Diode Selection

Question.3

A 12 V relay is driven by a transistor from a microcontroller pin. You need a diode across the relay coil for protection.
Which type of diode is the most appropriate choice?

A very small, low-current signal diode
A general-purpose rectifier diode rated for moderate current
A Zener diode matched to the relay voltage
A low-capacitance ESD protection diode

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