1. (5) Provide the following: (2.5) Provide a fully parameterized constructor. (2.5) Provide getters and setters for all attributes. Base Salary must be a non-negative value (make all the necessary changes) 2. (5) Add a toString method. The string it returns should first include the name of the class (Doctor and Nurse should be subclasses of Staff). It should look similar to to the following:

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