Question-

Which one of the following statements concerning diodes is false?

a) A diode is fabricated by forming junctions between one n-type and two p-type semiconductors or one p-type and two n-type semiconductors.

b) At an n-p junction in a diode that is not connected to a battery, an electric field exists across the junction.

c) A battery can be connected to a diode so that a continual flow of charge results.

d) A diode connected to an ac source allows current to flow only in one direction.

e) Holes move in a diode under a forward-bias condition.