If the C pk index exceeds $1$:

Select one:

a$.$ the process is capable of Six Sigma quality.

b$.$ the AQL must be smaller than the LTPD$.$

c$.$ must be less than one$-$third of the absolute value of the difference between each specification limit and the process mean.

d$.$ the process is characterized as "not capable."

e$.$ the $x-$bar chart must indicate that the process is in control.