Which of the following pairs are universal gates?

Which logic gate is represented by the following truth table?

$A$	$B$	$Y$
$0$	$0$	$0$
$0$	$1$	$1$
$1$	$0$	$1$
$1$	$1$	$1$

Identify the logic gate represented by the given circuit and match the values of $A, B, Y$ in the bracket to verify.

Which logic gate is represented by the following combination of logic gates?

The following figure shows a logic gate circuit with two inputs $A$ and $B$ and the output $Y.$ The voltage waveforms of $A, B$ and $Y$ are as given. The logic gate is

To get an output $Y=1$ from the circuit shown,the inputs $A, B,$ and $C$ must be respectively: