Answer the questions considering the following case - Best-East Electronics is at present in need of a database for their electronic shops. The shop sells TV, AC, Refrigerator etc. A customer can purchase a product by cash or credit card. A customer may also purchase an item over equal monthly installation (EMI). The EMI transaction history needs to be preserved in the database also. (a) Find appropriate database relation schemas with appropriate attributes. (b) Find Primary and Foreign Keys for all relations (tables). (c) Draw an Entity-Relationship (ER) diagram showing relation relationships. (Note: You are allowed to have necessary assumptions for the above scenario.) NEN