Which Five-Year Plan is known as the Mahalanobis Plan because of its emphasis on heavy industries?

Which Five-Year Plan is known as the “Mahalanobis Plan” because of its emphasis on heavy industries?
किस पंचवर्षीय योजना को भारी उद्योगों पर जोर देने के कारण “महालनोबिस योजना” कहा जाता है?

First Five-Year Plan / प्रथम पंचवर्षीय योजना Second Five-Year Plan / द्वितीय पंचवर्षीय योजना Third Five-Year Plan / तृतीय पंचवर्षीय योजना Fourth Five-Year Plan / चतुर्थ पंचवर्षीय योजना