Which of the following are extra- constitutional measures to promote cooperation and coordination between the Centre and the States?

1. 1.Niti Aayog
2. 2.Inter-state council
3. 3.Zonal Councils
4. 4.All India services
5. 5.Central council of health and family welfare
6. 6.UGC (University Grants commission)

Select the correct answer using the code given below: