The Indian Space Research Organization (ISRO) recently announced a significant discovery of an exoplanet. This breakthrough was achieved using an indigenously developed spectrograph. Identify the instrument used in this discovery.

1
 The Wide-Field Infrared Survey Explorer (WISE) at the Indian Astronomical Observatory in Hanle.
2
The PRL Advanced Radial-velocity Abu-sky Search spectrograph (PARAS) at the 1.2 m telescope of PRL at its Gurushikhar Observatory in Mt. Abu.
3
The Spectral Classification Instrument (SCI) at the Giant Meterwave Radio Telescope in Pune.
4
The Indian Spectroscopic Telescope Array (ISTA) at the Aryabhatta Research Institute of Observational Sciences in Nainital.

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