Sammy is the manager at California House. She recently hired Roly and Fred as servers to the restaurant. When conducting their monthly performance evaluation, Sammy compares Roly's performance to Fred's. Sammy states how Roly is much friendlier to guests than Fred is while Fred is faster than Roly is. Which of the following sources of deficiencies is Sammy conducting during this process? Group of answer choices Recency effect Halo Effect Error of central tendency Contrast effect