Perform Quality Control is the process of monitoring and recording results of executing the Quality Plan activities to assess performance and recommend necessary changes.(    ) are the techniques and tools in performing quality control.
①Statistical sampling            ②Run chart                ③Control charts
④Critical Path Method            ⑤Pareto chart           ⑥Cause and effect diagrams
A.①②③④ 
B.②③④⑤ 
C.①②③⑤⑥ 
D.①③④⑤⑥
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