In the context of statistical process control, which statement below is not true?

A) There is no relationship between control limits and specification limits.

B) The upper and lower natural tolerance limits are always wider than the upper and lower control limits of an x-chart.

C) Common causes of variation exist in both in control and out of control processes.

D) If x falls outside the UCL and the LCL no special causes of variation exist. E) In general, the R-chart should be evaluated before the x-chart.