Which of the following bodies does not/do not find mention in the Constitution?

Correct Option (d):

The Constitution of India establishes various bodies and provisions. However, some significant institutions operate outside the direct mention of the Constitution. The National Development Council, Planning Commission, and Zonal Councils fall into this category.

• National Development Council (NDC): Established in 1952 by an executive resolution, the NDC served as an apex body for decision-making and deliberations on development matters, coordinating between the Union government, state governments, and the Planning Commission. It is an extra-constitutional body.
• Planning Commission: Constituted in 1950 by a resolution of the Government of India, the Planning Commission was responsible for formulating India's Five-Year Plans. It was neither a constitutional body nor a statutory body. It was replaced by NITI Aayog in 2015.
• Zonal Councils: These councils were established under the States Reorganisation Act, 1956, a parliamentary act, to foster inter-state cooperation and coordination. They are statutory bodies, not constitutional bodies.

Therefore, all three bodies (National Development Council, Planning Commission, and Zonal Councils) do not find mention in the Constitution.

Incorrect Options:

Options (a), (b), and (c) are incorrect because they do not include all the bodies that are extra-constitutional or statutory and thus do not find mention in the Constitution. As explained above, the National Development Council and Planning Commission are extra-constitutional bodies, while Zonal Councils are statutory bodies, all of which are not mentioned in the Constitution.