16. Diode Selection

Question.1

A Zener diode is used to protect a 5 V logic rail from overvoltage conditions.
You must choose the Zener voltage for this protection.
Which choice is the most appropriate?

A Zener with a breakdown voltage well below 5 V
A Zener with a breakdown voltage slightly above the normal rail voltage
A Zener with a breakdown voltage much higher than 5 V
Any Zener diode, as long as it is connected across the rail

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