a. Rent on a warehouse that is large enough for all anticipated orders. b. Teachers for a private elementary school; one teacher is needed for every 15 students. c. Sheet steel for a producer of machine parts; steel is purchased in carload shipments, where each carload contains enough steel for 1,000 parts. Requirement 1. Which are step costs? Why? Begin by selecting whether the example is or is not a step cost, then choose the appropriate explanation as to why it is or why it is not a step cost. a. Rent on a warehouse that is large enough for all anticipated orders. b. Teachers for a private elementary school; one teacher is needed for every 15 students. c. Sheet steel for a producer of machine parts; steel is purchased in carload shipments, where each carload contains enough steel for 1,000 parts. Step cost