Q.1 Consider the following statements about Low Earth Orbit (LEO).
1. It is an Earth-cantered orbit with an altitude of 2,000 km or less.
2. The International Space Station conducts operations in LEO.
3. Major disadvantage of low Earth orbit is that it requires high amount of energy for satellite placement.
4. Spy satellites cannot use LEO.
Which of the above statements is/are incorrect?