The barrier potential of a p-n junction depends on:
$\left(a\right)$ type of semi-conductor material
$\left(b\right)$ amount of doping
$\left(c\right)$ temperature
Which one of the following is correct?

For the given circuit, the input digital signals are applied at the terminals $A,B$ and $C$. What would be the output at the terminal $y$ ?

Consider the following statements (A) and (B) and identify the correct answer.

(A) A Zener diode is connected in reverse bias when used as a voltage regulator.
(B) The potential barrier of $\mathrm{p}-\mathrm{n}$ junction lies between $0.1 \mathrm{V}$ to $0.3 \mathrm{V}$.