In a Zener diode with high breakdown voltageAEither P or N is lightly dopedBEither P or N is heavily dopedCBoth P and N are lightly doped

In a Zener diode with high breakdown voltage, either P or N is heavily doped. This is because the breakdown voltage in a Zener diode is directly related to the doping concentration. The more heavily doped the material, the lower the breakdown voltage. Conversely, the less doped the material, the higher the breakdown voltage. Therefore, for a Zener diode with a high breakdown voltage, either the P or N material would be heavily doped.