Which agencies collaborated in the IADT-1 trial and which human-rating systems elements had already been developed and tested prior to this trial?

The IADT-1 trial involved a multi-agency collaboration including ISRO, the Indian Air Force (IAF), DRDO, the Navy, and the Coast Guard, reflecting the cross-cutting operational requirements for human spaceflight recovery (air, sea, and search-and-rescue coordination). Prior to IADT-1, propulsion systems, life support models, and crew escape motors had already been developed and tested, indicating that parachute deceleration was a subsequent essential element in sequencing the human-rating test programme. The brief does not mention NASA involvement, in-orbit docking, or the other singular items in options (a), (c), (d), or (e), making (b) the accurate and fully detailed choice.