Question 4 (1 point) At zero direct labor hours in a flexible budget graph, the total budgeted cost line intersects the vertical axis at $30,000. At 15,000 direct labor hours, a horizontal line drawn from the total budgeted cost line intersects the vertical axis at $90,000. Fixed and variable costs may be expressed as: O a) $30,000 fixed plus $4 per direct labor hour variable. Ob) $60,000 fixed plus $4 per direct labor hour variable. Oc) $60,000 fixed plus $2 per direct labor hour variable. d) $30,000 fixed plus $6 per direct labor hour variable