In the circuit given below if the output $D=1$ the input must be

Question

 

$(a)\;A=0\;B=1\;C=0 \\ (b)\;A=0\;B=0\;C=1 \\ (c)\; A=1\;B=0\;C=1\\ (d)\;A=1\;B=0\;C=0 $