Which of the following are the types of satellites that are useful for gaining information regarding the earth and weather system?
1. Astronomical Satellites
2. Communications Satellites
3. Earth Observation Satellites
4. Navigation Satellites
5. Reconnaissance Satellite
Which of the following is correct?
1
1, 2 and 3 only
2
1, 3 and 5 only
3
1, 2, 3 and 4 only
4
All of the above