Physics · Space Communication

With reference to satellite-based communication systems, consider the following statements: 1. Geostationary satellites remain fixed relative to a point on the Earth's equator because their orbital period matches Earth's rotation. 2. Higher orbital altitudes of a communication satellite generally increase signal latency but expand its surface coverage area. 3. Polar-orbiting satellites are preferred over geostationary satellites for continuous real-time communication over a specific equatorial region. 4. Secure military communication satellites primarily rely on techniques like frequency hopping and advanced encryption to mitigate interception and jamming. Which of the statements given above are correct?