Q$12.$ The specification for a plastic liner for concrete highway projects calls for a thickness of $6\mathrm{.}0$ mm $0\mathrm{.}1$ mm$.$ The standard deviation of the process is estimated to be $0\mathrm{.}02$ mm$.$ What are the upper and lower specification limits for this product? The process is known to operate at a mean thickness of $6\mathrm{.}03$ mm$.$ Calculate Process Capability Index Cpk$?$A$)$lB$)1\mathrm{.}17$C$)1\mathrm{.}67$D$)2$E$)2\mathrm{.}17$