1 Which of the following statements is NOT true? A. All of the costs associated with preventing and dealing with defects once they occur are known as quality costs. B. Of the four groups of costs associated with quality of conformance, external failiure costs are generally the most damaging to a company. C. A variable manufacturing cost per unit remains the same within the relevant range. D. Common costs cannot be traced to cost objects individually. E. Sunk costs should be considered when comparing differential costs between alternatives