Which of the following is the best statemen?

Regression analysis, $5$S$,$ Ishikawa diagrams, and Pareto analysis can all be used for root cause analysis

A Ppk value of $1\mathrm{.}67$ indicates that root cause analysis is not required for a process

Pareto analysis can be used to identify root causes of production problems

A Ppk value of $1$ indicates that a process is highly capable

Control charts can be used to execute root cause analysis