If the process average is $,$ the standard deviation is o$,$ and n is the number of samples sampled $*10$ points each time, the control limit is expressed by: UCL $=\backslash$mu $+\backslash$kappa $\backslash$sigma $/$

u $\backslash$eta $,$ LCL $=\backslash$mu $-$ko$/$Vn$,$ which of the following is described correct?

$($A$)$ When the k value increases, the width of the control limit will become narrower

$($B$)$ As n increases, the width of the regulatory limit will become wider.

$($C$)$ The k value is generally set to $3,$ also known as $3$ times standard deviation control.

$($D$)$ The width of the control limit has nothing to do with the values $$of k and n