Consider the Boolean operator # with the following properties :
$x \# 0 = x, x \# 1=\overline{x}, x \# x = 0$ and $x \# \overline{x} = 1.$ Then $x\#y$ is equivalent to
- $x\overline{y}+\overline{x}y$
- $x\overline{y}+ \overline{x} \; \overline{y}$
- $\overline{x}y+xy$
- $xy+\overline{x} \; \overline{y}$