The overall average on a process you are attempting to monitor is $60\mathrm{.}0$ units. The process population standard deviation is $1\mathrm{.}84.$ Sample size is given to be $16.$ How do the control limits$$ change?

A$.$

The control limits are tighter for the $3-$sigma x overbar$-$chart than for the $2-$sigma x overbar$-$chart.

B$.$

The control limits for the $2-$sigma x overbar$-$chart and for the $3-$sigma x overbar$-$chart are the same.

C$.$

The control limits are tighter for the $2-$sigma x overbar$-$chart than for the $3-$sigma x overbar$-$chart.