Justify if MAC$($k$,$ x$)=$ H$($x$||$k$)$ defined iteratively stops the length$-$extension

attack. Do you believe this construction is secure from the point of view

of forgery? Justify informally$\mathrm{.}2$Justify if MAC$(k,x)=H(x||k)$ defined iteratively stops the length$-$extension

attack. Do you believe this construction is secure from the point of view

of forgery? Justify informally. ${?}^2$