Create a crows foot erd using a specialization hierarchy if appropriate. Granite sales company keeps information on its employees and the departments in which they work. For each department, the department name,internal mailbox server, and office phone extension are kept. A department can have many assigned employees, and each employee is assigned to only one department. Employees can be salaried, hourly, or work on contract. All employees are assigned an employee number, which is kept along with the employee's name and address. For hourly employees, hourly wages and target weekly work hours are stored; for example , the company may target 40 hours/ wekk for some employees, 32 for others, and 20 for others. Some salaried employees are salespeople who can earn comission percentage on sales and commission percentage on profit are stored in the system. For example, John is a salesperson with a base salary of $50,000 per year plus a 2 percent comission on the sales price for all the sales he makes, plus another 5 percent off the profit on each of those sales. For contract employees, the beginning date and end date of their contracts are stored along with the billing rate for their hours.