Detailed Explanation:

✅ Statement 1 – Correct: Akashteer is the automated Air Defence Control & Reporting System serving as the core of the Indian Army's Air Defence (AAD) network.

✅ Statement 2 – Correct: It seamlessly integrates with IAF's IACCS and Navy's TRIGUN systems, forming part of India's larger C4ISR (Command, Control, Communications, Computers, Intelligence, Surveillance, Reconnaissance) framework.

✅ Statement 3 – Correct: The system reflects a strategic shift from passive defence to proactive air defence through real-time threat detection, automation, and rapid response capabilities.

All three statements are correct, making Option 4 the right answer.