You work at a pizzeria in a very busy downtown area. At lunch, hundreds of people will come by for a slice of pizza, all within $90$ minutes, so you decide to make all the slices of pizza beforehand. You place them in a specially designed warming box.Customers don't get much customization, and you hold inventory, so they get their slices very quickly. What type of system is this?a push systema cross$-$functional systema kanban systeman agile system