What is Six Sigma ?

A. It is the most widely used strategy for statistical quality assurance
B. The “Six Sigma” refers to six standard deviations
C. It is the most widely used strategy for statistical quality assurance AND The “Six Sigma” refers to six standard deviations
D. A Formal Technical Review(FTR) guideline for quality walkthrough or inspection

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C. It is the most widely used strategy for statistical quality assurance AND The “Six Sigma” refers to six standard deviations