Constraint propagation $(6$ points$)$ Consider the CSPs represented by the constraint networks below: x$+2$ z y z $\{3,4\}\{1,2\}\{3,4\}$ z x $($x$+$y$)$ is odd y x$+2$ z y z $\{3,4\}\{1,2\}$ z x y $\{2,4\}($x$+$y$)$ is odd CSP I CSP II For each CSP$,1.$ State whether or not the CSP is arc$-$consistent. $2.$ If it is$,$ explain why. $3.$ If it is not, explain which domain must be reduced to make the CSP arc$-$consistent, and specify the constraint that can be used to reduce the domain.