Answer:
d. Behavior Observation Scale
Step-by-step explanation:
She uses the Behavior Observation Scale which refers to an appraisal method that measures behavior against levels of performance and also measures the frequency with which the behaviors occur as here Zoe would like to terminate the employee who is always busy on her cell phone and not focusing on her work, therefore, she is measuring the frequency of behavior of that employee so that she can share that information with the employee.