Horizon Books: Horizon Books is a bookstore in downtown Madina Munawara. It carries an inventory of approximately 50,000 books. Customers come in and browse the shelves, select their books, and take them to one of three cashiers positioned in different parts of the store. One of the cashiers is situated at an information desk where customers can discover whether a particular book is in stock, place orders for books not currently available in the bookstore, and collect and pay for books previously ordered. The cashier at the information desk has a book database that is consulted for every query. There are no credit sales. All customers pay for their purchases at the time of purchase. Draw a diagram showing all cardinalities.