In a numerical control (NC) machine positioning system, the measures of precision are expressed by considering a single axis is shown in the figure.If σ is the standard deviation of the error distribution, then l, m, and n are

• A. l = Accuracy, m = Repeatability, n = Control resolution
• B. l = Repeatability, m = Accuracy, n = Control resolution
• C. l = Control resolution, m = Repeatability, n = Accuracy
• D. l = Accuracy, m = Control resolution, n = Repeatability