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Which of the following statements is correct? A. An adverse direct material cost variance can be a combination of a favourable material price variance and an adverse material usage variance B. An adverse direct material cost variance can be a combination of a favourable material price variance and a favourable material usage variance C. An adverse direct material cost variance will always be a combination of an adverse material price variance and a favourable material usage variance D. An adverse direct material cost variance will always be a combination of an adverse material price variance and an adverse material usage variance |