Correct option is A
The correct answer is (a) YOUTHSAT
Explanation:
- YOUTHSAT is an experimental satellite launched by ISRO (Indian Space Research Organisation) in 20 April 2011.
 - It was a joint Indo-Russian satellite mission aimed at studying the upper atmosphere and space weather.
 - The satellite was mainly designed for scientific research and student participation in space exploration.
 
Information Booster:
- Launch Date: 20 April 2011
 - Mission Objectives:
 - Study the dynamics of the upper atmosphere.
 - Understand the impact of solar radiation on the Earth’s ionosphere and thermosphere.
 - Promote student participation in scientific space research.
 - Carried Three Payloads: Two Indian and One Russian payload for upper atmospheric studies.
 
Indian Space Research Organisation (ISRO)
ISRO is India's premier space agency, known for its cost-effective and efficient space missions. It operates under the Department of Space, which reports directly to the Prime Minister of India.
History & Establishment
- INCOSPAR (1962): Established under the Department of Atomic Energy (DAE) on Dr. Vikram Sarabhai’s recommendation.
 - First Rocket Launch (1963): Nike-Apache launched from Thumba Equatorial Rocket Launching Station (TERLS).
 - Formation of ISRO (1969): Replaced INCOSPAR with a broader mandate to harness space technology for national development.
 
Additional Knowledge:
- RESOURCESAT - I: Launched in 2003, it is an Earth observation satellite used for natural resource monitoring.
 - SCATSAT - I: Launched in 2016, it is used for weather forecasting, cyclone tracking, and sea surface wind studies.
 - RISAT - I: Launched in 2012, it is a radar imaging satellite used for agriculture, forestry, and disaster monitoring.