The real-time variation of input signals $A$ and $B$ are as shown below. If the inputs are fed into a $NAND$ gate,then select the output signal from the following.

The logic gate equivalent to the given logic circuit is

The truth table for the following logic circuit is:

Digital signals are characterized by which of the following statements?
$(i)$ They do not provide continuous values.
$(ii)$ They represent values in discrete steps.
$(iii)$ They can be represented by a binary system.
$(iv)$ They represent both binary and decimal systems.

$A$ logic gate circuit has two inputs $A$ and $B$ and output $Y$. The voltage waveforms of $A, B$ and $Y$ are shown below. Identify the logic gate circuit.

Which one of the following logic gates is called a Universal gate?