The LeVitre and Swezey Credit Union maintain separate bank accounts for each of its 20,000 customers. Three major ?les are the customer master ?le, the transaction ?le of deposits and withdrawal information, and a monthly statement ?le that shows a customer’s transaction history for the previous month. The following lists the bank’s most important activities during a representative month:
a. Customers make deposits and withdrawals.
b. Employers make automatic deposits on behalf of selected employees.
c. The bank updates its master ?le daily using the transaction ?le.
d. The bank creates monthly statements for its customers, using both the customer master ?le and the transactions ?le.
e. Bank personnel answer customer questions concerning their deposits, withdrawals, or account balances.
Draw a data flow diagram that graphically describes these activities.