Santa lucia industries employs 500 workers in the factory. these workers produced 85,000 units in the preceding year. due to a special order, the units produced in the current year increased to 95,000 units. however, santa lucia produced these units without adding workers. how is that possible? a. the labor cost associated with the additional units sold will be a relevant cost. b. the employees were a flexible resource in this situation. c. the plant had some unused activity capacity. d. none of these choices are correct.