Which of the Following Situations Suggests a Process That Appears

Which of the following situations suggests a process that appears to be operating in a state of statistical control?

A) A control chart with a series of consecutive points that are above the center line and a series of consecutive points that are below the center line.
B) A control chart in which no points fall outside either the upper control limit or the lower control limit and no patterns are present.
C) A control chart in which several points fall outside the upper control limit.
D) All of the above.