Explanation:

All pairs are correctly matched Supplementary notes: Project 17A

 The Project 17A programme was approved by the Indian Government in February 2015 to enhance the combat capabilities of the Indian Navy.

 The lead ship of the class, INS Nilgiri, was launched at Mazagon Dock Shipbuilders, Mumbai, in September 2019. The keel for the third ship was laid in September 2020.  GRSE launched the fi rst of its three Project 17A ships, Himgiri, in December 2020.

 It was fl oated out on the waters of Hoogly River in the Indian state of Kolkata and is expected to be delivered in August 2023. Project 28

 Work on India’s fi rst completely indigenous next generation missile corvette, Project 28A, was said as of mid-2013 to be “underway” and the fi rst boat which was undergoing sea trials was expected to be inducted by the end of 2013, after much delay.

 The Indian Navy speci fi ed that there should be one multi-function surveillance and threat alert radar in the warships for early warning and target identi-fication.

 There were presently more than 50 ships and submarines under construction in India. India has already built four antisubmarine warfare corvettes under Project28, the fi rst of which was handed over to the Indian Navy in 2014. Project 75

 Indian Navy’s fi fth Scorpene class submarine Vagir, having superior stealth features like the advanced acoustic absorption technique, was launched on November 12 at the Mazagon Dock in south Mumbai.  Vagir is part of the six Kalvari-class submarines being built in India.

 The submarines, designed by French naval defence and energy company DCNS, are being built as part of Indian Navy’s Project75.