Which One of The Following Rules is NOT Used For Identifying

Which one of the following rules is NOT used for identifying an out of control process?

[A] A process is assumed to be out of control if a single point plots outside the control limits
[B] A process is assumed to be out of control if there is run of six or more consecutive points steadily increasing or decreasing
[C] A process is assumed to be out of control if nine or more consecutive points fall to one side of center line
[D] A process is assumed to be out of control if two or consecutive points fall beyond the 1σ limits on the same side of the center line

Correct Answer is A process is assumed to be out of control if two or consecutive points fall beyond the 1σ limits on the same side of the center line