What Do You Look for to Determine When a Process

What do you look for to determine when a process is 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 all the points are exactly the same.
D) All of these choices are true.