The Union Council of Ministers is the executive body of the Government of India, headed by the Prime Minister. It consists of Cabinet Ministers, Ministers of State, and Deputy Ministers. The correct answer is option 'A', which includes all three categories of ministers.

- Cabinet Ministers: Cabinet Ministers are senior ministers who are in charge of major government departments and ministries. They are usually political leaders with significant experience and expertise in their respective fields. Cabinet Ministers are appointed by the President on the advice of the Prime Minister.

- Ministers of State: Ministers of State are junior ministers who assist the Cabinet Ministers in their work. They are usually responsible for specific areas or departments under the Cabinet Ministers. Ministers of State are also appointed by the President on the advice of the Prime Minister.

- Deputy Ministers: Deputy Ministers are further junior ministers who assist the Cabinet Ministers and Ministers of State. They have a lower rank and are responsible for specific tasks or projects within their respective ministries. Deputy Ministers are also appointed by the President on the advice of the Prime Minister.

The inclusion of all three categories of ministers in the Union Council of Ministers ensures a hierarchical and efficient structure for the functioning of the government. Cabinet Ministers provide overall leadership and decision-making, while Ministers of State and Deputy Ministers assist in the implementation of policies and programs.

In summary, the Union Council of Ministers consists of Cabinet Ministers, Ministers of State, and Deputy Ministers. They collectively form the executive body of the Government of India and work under the leadership of the Prime Minister.