The highest grade in the Civil Service is known... - JAMB Government 2021 Question

Option D is the correct answer.

The highest level of civil servants responsible for overseeing and coordinating ministries activities are known as the Administrative Cadre. They are responsible for carrying out high-level administrative tasks, providing advice to ministers on policies creation and executing, and acting as a liaison between ministers and other civil servants. 

Entry into this class is achieved through a rigorous selection process that includes a university education, competitive written exams, and interviews organized by the Civil Service Commission. This class includes positions such as Directors-General, Directors, Deputy Directors, and Assistant Directors.