The performance appraisal method used by Darnita is Forced choice appraisal method.
Explanation:
Forced choice method forces Darnita to make the choice between the given characteristics of "Cheerful or Confident" about the employee. Every employee should be placed under each category mentioned. In simple words it seems to be like multiple choice questions and the option is chosen from the given options.
The choices would be either positive or negative. In some case even the answerer does not know which option suits for the employee so he would be forced to select anyone of the given options. Many feedback in companies or appraisal would be based on forced choice appraisal in which some higher authority will not have the control to decide whether the performance of the employee is good or bad.