Consider the following domain description The items sold by a chain of furniture stores are identified by the item's model name and colour. Each store in the chain is in a different city. Within a par- ticular store, the place where an item can be found is given by a section name and a shelf number (e.g. section "A", shelf "4"). While most items are sold in a single package, some items are so large that they are sold in two or more pack ages. Each package has a part number (e.g. if an item is sold in two packages, these packages will be identified by part numbers "1" and "2"). Each package also has a length, width, height and weight. Each purchase made from a store consists of one or more items and may include several instances of the same item (e.g. 4 chairs with the same model name and colour). The owners of the chain of furniture stores want to record which purchases were made from each store To help with this, each purchase is given a unique purchase reference number. 

When recording a purchase, the quantity of each item bought must be recorded and also the purchase date. In the case of purchases made using a credit card the credit card number and credit card type must also be recorded 

a) Draw an E-R diagram that correctly models this domain.