Who among the following played a decisive role in integrating the Princely States of India?

Sardar Vallabhbhai Patel played a decisive role in integrating the over 560 princely states into the Indian Union after independence. As the first Home Minister and Deputy Prime Minister of India, he, along with V.P. Menon, used a combination of diplomacy, persuasion, and where necessary force (as in the case of Hyderabad and Junagadh) to integrate these states. For this, he earned the title 'Iron Man of India' and 'Bismarck of India'.