The output of the circuit shown in the figure is:
1
\(\overline {AB} + \overline {AC} + \;\overline {BC}\)
2
\(\overline {AB} + \overline {AC} + \;\overline {BC} + \overline {AB} \;C\)
3
\(\overline {ABC} \)
4
\(\bar A + \bar B + \bar C\)
The output of the circuit shown in the figure is: