Which of the following statements is true? Multiple Choice 0 Flexible budgets can only be used when there is more than one cost driver. 0 A revenue variance is the difference between the amount of the revenue in the master budget and the amount of the revenue in the flexible budget. 0 Fixed costs should not be included in a flexible budget because they do not change when the level of activity changes. 0 If actual activity exceeds budgeted activity, the spending variance for an expense will always be unfavorable The fixed component of a budget for a cost has no effect on its activity variance