What does it mean if a single data point appears above the upper specification limit on a control chart?

A. The process is in control and the customer is happy.

B. The process may be out of control, and consideration should be given to checking the process soon.

C. A single data point outside the upper specification is okay. You only need to be concerned if there are seven consecutive data points outside either of the specification limits.

D. The process is out of control and requires immediate action, because the customer will not accept any deliverables outside the specification limit.