Correct option is C
Under the Reverse biased condition, the opposition offered by the diode to the reverse current is known as Reverse Resistance.
Ideally, the reverse resistance of a diode is considered to be infinite.
However, in actual practice, the reverse resistance is not infinite because diode conducts a small leakage current (due to minority carriers) when reverse biased.
The value of reverse resistance is very large as compared to forward resistance.
The ratio of reverse to forward resistance is 100000:1 for silicon diodes, whereas it is 40000:1 for germanium diode.
