Which of the following logic gates will have an output of '1' (one) for the given inputs?

A diode and resistance are connected as shown in figures.

Out of the following statements, which one is true?
Diode in
A) fig (1) and fig (2) are both forward biased.
B) fig (1) and fig (2) are both reverse biased.
C) fig (1) is forward biased and in fig (2) is reverse biased.
D) fig (1) is reverse biased and in fig (2) is forward biased.

In the following digital circuit, the output 'Y' will be '1' (one) for inputs 'A' and 'B' having values

In common emitter configuration of transistor amplifier, $r_i$, $R_L$ and $\beta$ represent the input resistance, load resistance and the a.c. current gain respectively. The voltage gain $A_V$ and power gain $A_P$ are represented in magnitude respectively by