Studies on a machine that molds plastic water pipe indicate that when it is injecting $20-$inch diameter pipe, the process standard deviation is $0\mathrm{.}6$ inches. The ten$-$inch pipe has a specification of $20-$inch plus or minus $2\mathrm{.}0$ inch. What is the process capability if the long$-$run process mean is $20$ inches?

Group of answer choices

$2\mathrm{.}00$

$1\mathrm{.}11$

$0\mathrm{.}89$

$0\mathrm{.}50$