Q$7.$ The specification for a plastic handle calls for a length of $6\mathrm{.}0$ inches $\backslash$pm $0\mathrm{.}2$ inches. The standard deviation of the process is estimated to be $0\mathrm{.}05$ inches. The process is known to operate at a mean thickness of $6\mathrm{.}1$ inches. Calculate Process Capability Index Cp for this process?

A$)0\mathrm{.}67$

B$)1\mathrm{.}00$

C$)1\mathrm{.}33$

D$)1\mathrm{.}67$

E$)2$