Jardell Corporation makes a product with the following standards for labor and variable overhead: The company budgeted for production of 6,400 units in June, but actual production was 6,400 units. The company used 3,180 direct labor-hours to produce this output. The actual variable overhead rate was $4.90 per hour. The company applies variable overhead on the basis of direct labor-hours. The variable overhead rate variance for June is: A) $318 U B) $320 F C) $318 F D) $320 U