document or PDF file. For each exercise, given the business scenario, create a Crow's Foot ERD using a specialization hierarchy if appropriate. Diagrams must spell out all attributes for each entity and label primary and foreign keys. Crow's foot symbols must be used, where both optionality and cardinality constraints are indicated. Two-Bit Drilling Company keeps information on employees and their insurance dependents. Each employee has an employee number, name, date of hire, and title. If an employee is an inspector, then the date of certification and the renewal date for that certification should also be recorded in the system. For all employees, the Social Security number and dependent names should be kept. All dependents must be associated with one and only one employee. Some employees will not have dependents, while others will have many dependents. 1