Answer : 4. "Ashok Chanda"
Explanation :

1. The Planning Commission was called the Economic Cabinet of India by Ashok Chandra.

2. The Planning Commission is a non-constitutional and non-statutory body and is responsible for preparing five-year plans for social and economic development in India.

3. The government replaced the Planning Commission with a new institution NITI Aayog (National Institution for Transforming India) on 1 January 2015.