Answer : 4. "घुड़सवारी "
Explanation :

1. The Indian Navy has submitted a proposal to the government for the construction of its second indigenous aircraft carrier, known as Indigenous Aircraft Carrier-2 (IAC-2).

2. Cochin Shipyard Limited (CSL) delivered the first indigenously built aircraft carrier (IAC-1) INS Vikrant to the Indian Navy in July 2022.