4. (10 points) A bank has three types of accounts: checking, savings, and loan. Following are the attributes for each types of account: a. CHECKING: Account No., Date Opened, Balance, Service Charge b. SAVINGS: Account No., Date Opened, Balance, Interest Rate c. LOAN: Account No., Date Opened, Balance, Interest Rate, Term, Payment Assume that each bank account must be exactly one of these three types. Using generalization, develop an EER model to represent this situation. You need to specify both completeness and disjointness constraints and include a subtype discriminator.