The sensitive information leaked in August 2016 concerns which one of

The sensitive information leaked in August 2016 concerns which one of the following defence platforms of India?

Fifth Generation Fighter Aircraft
Combat Helicopters
Submarines
Unmanned Aerial Vehicles
This question was previously asked in
UPSC CDS-1 – 2017
The sensitive information leaked in August 2016 concerned India’s submarines.
The leak, known as the “Scorpene leak”, involved over 22,000 pages of confidential data about the capabilities of six Scorpene-class submarines being built for the Indian Navy by Mazagon Dock Limited, based on design and technology transfer from French company DCNS (now Naval Group).
The leaked documents detailed the submarines’ combat capabilities, including information on sensors, weapons, and underwater communications, raising concerns about the security of the fleet.