Explanation:

- The IRNSS (Indian Regional Navigation Satellite System) is designed for providing accurate position information services to users in India and the surrounding region.

- It is useful for navigation, similar to GPS, and is intended to be India's own independent system for satellite-based navigation.

- IRNSS does not directly provide telecommunication services, which are typically different from navigation services.

Based on the above points:

- Option 1, 1 only: Only considers navigation, which is correct but incomplete.

- Option 2, 1, 2 only: Includes both navigation and India’s version of GPS, aligning with IRNSS's actual functions.

- Option 3, 1, 3 only: Includes navigation and telecommunication, the latter of which is incorrect.

- Option 4, 1, 2 & 3: Suggests all functions, which is incorrect due to it including telecommunication.