$($b$)(9\%)$ Recall that f$4$ is originally configured with $($n$,$ k$)=(14,10)$ Reed$-$Solomon codes

in each cell to tolerate four disk failures. Suppose that it now changes the configuration

to $($n$,$ k$)=(16,12).$ Explain how it affects storage redundancy, single$-$block repair

performance, and single$-$block update performance quantitatively, in terms of the percentage of increase$/$decrease$.$