Which of the following statements is/are correct about a p-n junction diode?

(a) The threshold voltage or cut-in voltage for germanium diode is about 0.7 V.

(b) The current under reverse bias is essentially voltage independent up to breakdown voltage.

Correct option is D

In the reverse bias region, the current is very small and essentially independent of the applied reverse voltage until the diode reaches the breakdown voltage.

Once the breakdown voltage is reached, the current increases sharply.