$29.$ Industry members encounter relatively weak supplier bargaining power wenA suppliers provide an item that accounts for a small fraction of the costs of the industry's product.B certain suppliers provide a differentiated input that enhances the performance or quality of the industry's product.C suppliers are not dependent on industry members for a significant portion of their revenuesD the item being supplied is a commodity that is readily available from many suppliers at the going market price.E the cost of switching from one supplier to another is high.