The correct answer is “It is a constitutional body”.
Zonal Councils are not constitutional bodies, they were set up under the State Reorganization Act of 1956 to promote cooperation and coordination among the states in India.
There are five zonal councils in India: Northern, Central, Eastern, Southern, and Western. Chandigarh, being a Union Territory, is included in the Northern Zonal Council.
The Zonal Councils are advisory bodies and their recommendations are not binding on the central or state governments.