Which of the following is true, according to the textbook?

Answers:	a. The action suggested by a revenue variance can vary significantly depending on the firm's strategy.
	b. A favorable sales quantity variance leads to a favorable direct materials price variance.
	c. Revenue variances do not vary from how they are presented in the textbook.
	d. The two revenue variances covered in the textbook are the sales price variance and the sales cost variance.