a
(a) From the given waveforms, the following truth table can be made 

Time interval	Inputs	Inputs	Output
	\(A\)	\(B\)	\(Y\)
\(0 →T_1\)	\(0\)	\(0\)	\(0\)
\(T_1 → T_2\)	\(0\)	\(1\)	\(0\)
\(T_2 → T_3\)	\(1\)	\(0\)	\(0\)
\(T_3 → T_4\)	\(1\)	\(1\)	\(1\)

This truth table is equivalent to \(‘AND’ \) gate.