Final answer:
The Graphic Rating Scale (GRS) is the most widely used form of performance appraisal, noted for its simplicity and straightforward rating system compared to the comprehensive but sometimes unreliable 360-degree feedback method. Correct answer is A. 360-degree feedback.
Step-by-step explanation:
The most widely used form of performance appraisal is D. Graphic Rating Scale (GRS). While 360-degree feedback is a comprehensive approach that involves multiple sources of feedback, studies suggest that the ratings can be unreliable and supervisors may underrate employees based on their self-assessment.
Moreover, the variability in ratings provided by this method is seen as either a point of concern or a potential for learning, as it necessitates discussion to understand discrepancies. On the other hand, Graphic Rating Scales are simpler and more straightforward, often employing a Likert-type scale to rate various aspects of an employee's performance. Correct answer is A. 360-degree feedback.