All of the following describe pull-based models of supply cahins, EXCEPT: a. they are sometimes known as demand-driven models, b. they are sometimes known as build-to-order models, they are based haeavily on forecasts or guesses of customer demand for products, d. they allow manufacture to make use of actual order demand inforamtion to driven..., e. they can be supported by systems that make use of Internet and related technolgoies