To get an output of 1 from the circuit shown in figure the input must be :

$\mathrm{a}=0, \mathrm{~b}=0, \mathrm{c}=1$

$\mathrm{a}=1, \mathrm{~b}=0, \mathrm{c}=0$

$\mathrm{a}=1, \mathrm{~b}=0, \mathrm{c}=1$

$\mathrm{a}=0, \mathrm{~b}=1, \mathrm{c}=0$