please answer question c. it can be made in point form. this is a short answer question

This question relates to performance management a. You are an HR manager trying to determine the best formal appraisal method to use to evaluate your employees' performance. You are debating between using a trait method and a behavioural method, which one would you choose and why? Be sure to describe both the advantages and disadvantages of each approach. (4 marks) b. Describe and discuss 3 things that managers must do to ensure that performance management systems are fair and legal. Be sure to fully explain the importance of each of your points. (3 marks) c. How often should employees' performance be formally reviewed? Give sufficient rationale for your answer, making sure to discuss the factors that influence the frequency of performance review