Q$12.$ The specification for a plastic liner for concrete highway projects calls for a thickness of $6\mathrm{.}0mm+-0\mathrm{.}1mm.$ The standard deviation of the process is estimated to be $0\mathrm{.}02mm.$ What are the upper and lower specification limits for this product? The process is known to operate at a mean thickness of $6\mathrm{.}03mm.$ Calculate Process Capability Index Cpk$?$

A$)1$

B$)1\mathrm{.}17$

C$)1\mathrm{.}67$

D$)2$

E$)2\mathrm{.}17$