Performance appraisal: O a. allows a manager to let subordinates know how well they are doing. O b. is not an important part of human resources management. Oc. allows employees to beat the system by having an excuse for not performing at the rate or skill level that the firm wants d. does not provide an effective basis for distributing rewards such as pay raises and promotions. Oe. does not allow monitoring of employee selection or training and development activities