How do you go about adding an Enable $($E$)$ signal to the decoder in Figure $4\mathrm{.}7?$ Modify the implementation to show that. $($Design Only using chips in Figure $1).$Implement f$($x$,$ y$,$ z$)=$ m$(0,1,4,6,7),$ using $4$x$1$ MUX using chips in Figure $1.$