Which of the following is used to calculate total variable overhead variance where VOH = Variable Overhead, SVOR = Standard Variable Overhead Rate, SH = Standard Hour Allowed, and AH = Actual Direct Labor Hours Used?

a.Total VOH Variance = Variable VOH – SVOR × AH
b.Total VOH Variance = Fixed VOH – SVOR × AH
c.Total VOH Variance = Standard VOH – SVOR × SH
d.Total VOH Variance = Actual VOH – SVOR × SH
e.None of these choices are correct.