Which of these correctly shows the correct values for standardized u-chart in the order of CL, UCL and LCL?

Which of these correctly shows the correct values for standardized u-chart in the order of CL, UCL and LCL? Correct Answer 0, 3 and -3

THE u-chart, when standardized, has the center line at zero value. The values of the UCL and LCL of the standardized version of u-chart, plotted for short production runs, are ±3.

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