Which of the following is not a function of the Union Public Service Commission?

The correct answer is (D) To classify services and determine pay scales of civil servants.

• The Union Public Service Commission (UPSC) is a constitutional body established under Article 315 of the Indian Constitution, tasked with conducting examinations for appointments to the all-India services and central services.
• While the UPSC advises the President on recruitment methods and personnel management, the classification of civil services, determination of pay scales, service conditions, and cadre management fall under the purview of the Department of Personnel and Training (DoPT) and the Pay Commissions.
• Options (A), (B), and (C) are explicit functions of the UPSC under Article 320 of the Constitution, which includes conducting civil services exams, assisting states upon request with joint recruitment schemes, and advising on recruitment methods.