Which one among the following statements about Agni-I is correct ?

Agni-I is a single-stage, solid-fuel ballistic missile developed by India's DRDO [t1][t4]. It was specifically designed to fill the range gap between the Prithvi-II and Agni-II missiles following the Kargil War [t4][t8]. Unlike the original Agni technology demonstrator which used a liquid-fueled second stage, the operational Agni-I utilizes a single solid propellant stage [t3][t6]. Regarding its range, multiple sources confirm its standard striking range is approximately 700–900 km [t1][t9], with some variants or reduced payloads potentially reaching up to 1250 km [t2][t8]. Therefore, statement 1 is correct as it accurately describes the missile's propulsion and stage configuration. Statements 2 and 4 are incorrect as the maximum range does not reach 1500 km, and statement 3 is incorrect because Agni-I is a single-stage system, whereas Agni-II is the two-stage version [t1][t3].

Sources

1. [1] https://en.wikipedia.org/wiki/Agni_(missile)
2. [2] https://en.wikipedia.org/wiki/Agni-I