The following network is a multi$-$layer perceptron, where all of the units have binary inputs $(0$ or $1)$ and binary outputs $(0$ or $1).$

The weights for this network are w$31=1,$ w$32=1,$ w$41=1,$ w$42=1$ and w$43=3.$

The threshold of the hidden unit $(3)$ is $1\mathrm{.}5$ and the threshold of the output unit $(4)$ is $0\mathrm{.}5.$

The threshold of both input units $(1$ and $2)$ is $0\mathrm{.}5,$ so the output of these units is exactly the same as the input. Which of the following Boolean functions can be computed by this network?

AND, OR$,$ XOR or none?