Which of the following statements about fixed overhead variances is correct?

A$)$ Fixed overhead variances consist of a budget variance and an efficiency variance.

B$)$ The budget variance is a measure of facility utilization.

C$)$ The volume variance represents the difference between the actual fixed overhead cost incurred during a period and the original budgeted fixed overhead cost.

D$)$ A favorable volume variance means that a firm's production facilities were over$-$utilized by producing more units of products than budgeted.