Consider the following UML diagram which models an online bookstore. a. Convert the UML model to ER design. b. List the entity sets and their primary keys. c. Suppose the bookstore adds Blu-ray discs and downloadable video to its collection. The same item may be present in one or both formats, with differing prices. Extend the E-R diagram to model this addition, ignoring the effect on shopping baskets. n, to madel Now extend the E-R diágram, using generalization, to model the case where a shopping basket may contain an combination of books, Blu-ray discs, or downloadable video. author publisher mae address URL name address phone URL customer written_by email published_by nam address phone book number ISBN title shopping basket basket_id basket of year contains price number warehouse code address phone stocks

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