Process Capability Index: A key joint in a precision machining process has a lower specification limit of a width of 0.99mm and an upper specification limit of 1.01mm. The standard deviation is 0.005 mm and the mean is 1mm. What is the process capability index for the precision machining process? Pick the closest answer \begin{tabular}{l} 0.01 \\ 0.33 \\ 0.67 \\ 0.99 \\ \hline 1.33 \\ \hline 1.67 or greater \end{tabular}