ProNet Systems is a start-up company that makes connectors for high-speed Internet connections. The company has budgeted variable costs of $140 for each connector and fixed costs of $9,500 per month. ProNet's static budget predicted production and sales of 100 connectors in August, but the company actually produced and sold only 80 connectors at a total cost of $28,000. ProNet's sales volume variance for total costs is O A. $7,300 U. OB. $2,800 F. O c. $7,300 F. OD. $2,800 U.