The correct option is D All of the above
Council of Ministers is categorised into three categories.
1- Cabinet Ministers - They act as head of important ministries (like Defense Ministry, Home Ministry, etc.) of the central government and play important role in framing policies.
2- Ministers of State - They can be given Independent charge of ministries or can be attached to the cabinet ministers. When attached to the cabinet ministers, they work under the guidance of cabinet ministers.
3- Deputy Ministers - They are never given independent charge of ministry (unlike ministers of state), and always remain attached to the cabinet ministers or ministers of state. They assist to discharge the political, administrative and parliamentary duties effectively.