Create an ER diagram for the following description: Each company has a name and location (address + city, state, zip) and it owns and operates at most 10 departments. Each department, in turn, has its own name and location, it belongs (is owned) by one company and has employees. Each employee has his id#, name and address and works for one department. Also, an employee may have one or more dependents whose names need to be stored. Moreover, an employee may or may not have an employment history, which consists of company name and dates worked.