on 24 . A major difference between manufacturing and service systems in terms of scheduling is: out of Select one: O a variability in arrival and service rates Ob output rate O c. length of processing time Od the number of units to be processed O e processing cost per unit en 25 The MRP input stating which end items are to be produced, when they are needed, and what quantities are needed, is the: ed out of Select one: O a. net-requirements chart O b. bill-of-materials O c. assembly-time chart O d. inventory-records O e. master production schedule