নিম্নলিখিত কোনটি মহাকাশ -ভিত্তিক বর্ধন ব্যবস্থা? A. INSAT B. GAGAN C. GSAT D. SARAL

GAGAN (GPS Aided GEO Augmented Navigation), built by ISRO and the Airports Authority of India, is India's Space-Based Augmentation System. It improves the accuracy of GPS signals for aviation. INSAT and GSAT are communication satellites, and SARAL is an oceanographic satellite.