please answer thorougly

Question 3 A hardware store discharged a member of staff who had been working for the company for twelve (12) months. The employee, who was fifty-three (53) years old, claimed that she was discriminated against because of her age, as the company wanted to put someone younger in her position. An investigation was carried out, and the hardware store owner stated that the employee was terminated because of continued poor performance. He was asked to provide copies of the employee's appraisals to justify that the termination was based on poor performance and not the employee's age. The hardware owner was unable to provide performance appraisals for any of the employees. The matter was settled out of court with the employee being compensated. The manager, not wanting to find himself in such a predicament asks for your assistance: A Explain to him what a performance management system. In the process, describe what a performance appraisal is. B. Discuss with the hardware owner THREE (3) uses of performance appraisals to help him understand why it is important for employers to do performance appraisals for each employee C. Suggest THREE (3) performance appraisal methods that could be used considering his limited knowledge and the type of job and employees. Assess cach method giving one advantage and one disadvantage of each