A manufacturer embarking on a Six Sigma program sets the goal of having true Six Sigmacapability for all processes by the end of the month. If their current process capability index on akey metric is less than $2\mathrm{.}0$ and the process capability ratio is $1\mathrm{.}5,$ what must happen with theprocess standard deviation?A$)$ The process standard deviation must be reduced by $25\%.$B$)$ The process standard deviation must be reduced by $33\%.$C$)$ The process standard deviation must be reduced by $50\%.$D$)$ The process standard deviation must be reduced by $67\%.$