Two costs at Carrie Company appear below for specific months of Month Amount Units Produced Upkeep costs April $ 40,000 40,000 May 55,000 60,000 Services costs April $ 84,000 40,000 May 126.000 60,000 Which type of costs are these? O Upkeep costs are mixed and services are variable. O Services costs and upkeep are both mixed. O Services are mixed and upkeep costs are variable. O Upkeep costs and services are both variable