Satellites used for telecommunication relay are kept in a geostationary orbit. A satellite is said to be in such an orbit when: 1. The orbit is geosynchronous. 2. The orbit is circular. 3. The orbit lies in the plane of the Earth's equator. 4. The orbit is at an altitude of 22,236 km. Select the correct answer using the codes given below:

1. Statement 1 is correct: A geostationary orbit is a specific type of geosynchronous orbit. A geosynchronous orbit has an orbital period matching the Earth's rotational period. 2. Statement 2 is correct: To remain fixed over a point on the equator, the orbit must be circular. An elliptical orbit would cause the satellite to move relative to a ground station. 3. Statement 3 is correct: The orbit must lie in the plane of the Earth's equator (i.e., have an inclination of 0 degrees) for the satellite to appear stationary in the sky. 4. Statement 4 is incorrect: The specific altitude required for a geostationary orbit is approximately 35,786 km (about 22,236 miles) above the Earth's equator, not 22,236 km. Therefore, statements 1, 2, and 3 are the conditions for a satellite to be in a geostationary orbit.