The following is monthly budgeted cost and activity Information for two activities in the purchasing department of Company Activity Variable Costs Fixed Costs Cost Driver Supplier relations $9.450 $15,500 350 suppliers Invoiding $8,100 $28,400 810 Invoices In November, actual costs and activity were as follows: Activity Total Costs Driver Amount Supplier relations $23,750 308 suppliers Invoicing $35,044 755 Invoices What was the flexible budget variance for the supplier relations activity for November (assume that favorable variances are positive numbers and unfavorable variances are negative numbers)? A: 5-15,434 OB $-14,300 C: $-8,250 OD: 0 OE: $66 OF: $1,200