1. The following E-R model describes data about customers. Common data for all customers are ID, Name, Address, and Contact including Phone and Emai. Special data for online customers are LoginName and Password. (a) Perform specialization to the E-R model to produce an E-R model with the superclass entity, Customer, and a subclass entity, OnlineCustomer. (b) Give at least one instance of the superclass and the subclass entity in part (a). Phone Email C D Name Name ( Address Address Contact Contact ( LoginName) LoginName ( Password Password Customer