The correct option is 1, 2 and 3 only.
Explanation
India's space infrastructure is categorized into specific satellite systems designed for distinct applications, primarily communication (INSAT/GSAT) and earth observation (IRS), supported by indigenous launch vehicle technology.
- Statement 1 is Correct: The Indian National Satellite (INSAT) system is a multipurpose geo-stationary satellite system. It is primarily commissioned to facilitate telecommunications, broadcasting, meteorology, and search and rescue operations across India.
- Statement 2 is Correct: The Indian Remote Sensing (IRS) satellites are Earth observation satellites. They are specifically utilized for the survey and management of natural resources, land use planning, agriculture, and environmental monitoring.
- Statement 3 is Correct: Satellite systems are integral to weather forecasting (using meteorological payloads on satellites like INSAT-3D) and disaster management support system (DMS), providing critical data and communication links during natural calamities.
- Statement 4 is Incorrect: The Polar Satellite Launch Vehicle (PSLV) is the primary launch vehicle of the Indian Space Research Organisation (ISRO). It has launched numerous Indian satellites, including Earth observation satellites and interplanetary missions (e.g., Chandrayaan-1, Mars Orbiter Mission), in addition to commercial launches for foreign satellites. It is not limited to foreign payloads.
Key Takeaway: The INSAT system is dedicated to communication and meteorology, whereas the IRS system focuses on remote sensing and resource assessment. PSLV is a versatile launch vehicle used for both domestic and international missions.