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The correct statements about Astra are 2 and 3 only.
Statement 1 is incorrect because Astra is not procured by India from Russia. Astra is an indigenously developed missile by the Defence Research and Development Organization (DRDO) of India.
Statement 2 is correct. Astra is indeed a single-stage, smokeless, solid-propelled missile. This means that it uses solid propellant for its propulsion and does not emit any smoke during its flight, making it difficult for enemy forces to track.
Statement 3 is also correct. Astra can be launched from different altitudes, including ground-based launchers, aircraft, and ships. This flexibility allows it to be used in various operational scenarios and platforms.
In conclusion, option 2 is the correct answer, as statements 2 and 3 are the correct statements about Astra.