4. The figure below shows an EE R diagram for a simplified credit card environment. There are two types of card accounts: debit cards and credit cards. Credit card accounts accumulate charges with merchants. Each charge is identified by the date and time of the charge as well as the primary keys of merchant and credit card. a) Transform the EER diagram to a set of relations and develop a relational schema b) Show the functional dependencies CUSTOMER Customer ID Cust Name Cust Address MERCHANT CARD ACCOUNT Account ID MerchD Merch Addr Card Type Type CHARGES DEBIT CARD Bank No CREDIT CARD Cur Ba Charge Date Charge Time Amount