Option 1 -> EOS-08 is an Earth Observation Satellite designed for applications like agriculture, disaster management, and environmental monitoring, not solar studies.
Option 2 -> INSAT-3DS-GSLV-F14 is a meteorological and communication satellite meant for weather forecasting and satellite communication services.
Option 3 -> ADITYA-L1 is India's first dedicated solar mission positioned at the L1 Lagrange point to continuously study the Sun's corona, solar emissions, and space weather phenomena.
Option 4 -> RLV LEX-03 is a Reusable Launch Vehicle Landing Experiment focused on developing reusable rocket technology, not solar research.
Hence, Option 3: ADITYA-L1 -> This mission reached its operational halo orbit around the Sun-Earth L1 point in January 2024 and is specifically designed to unravel mysteries of the Sun including coronal heating, solar winds, and solar storms -> correct