When a control chart has been constructed and is being used to assure process quality, which of the following indicate that a process is not operating in a satisfactory or acceptable manner?

A$.$ Plotted sample values are outside the upper or lower control limits

B$.$ Plotted samples fall within the upper and lower control limits $.$

C$.$ Plotted samples demonstrate a non$-$random pattern or trend

D$.$ Plotted samples demonstrate a purely random pattern or trend

A and $C$

A and D