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