Explanation:

The pressure was calculated from data obtained by observation of stellar occultation by Pluto on 6 June 2020 using 3.6-m Devasthal optical telescope (DOT) (India's largest optical telescope) and 1.3-m Devasthal Fast Optical Telescope (DFOT) telescopes located at Devasthal, Nainital.

• A team of scientists, including Indian and International collaborators, have derived the accurate value of Pluto's atmospheric pressure at its surface. It is more than 80,000 times less than the atmospheric pressure at mean sea level on Earth. 
• An international team of scientists, including members from Aryabhatta Research Institute of Observational Sciences (ARIES), used signal-to-noise ratio light curves obtained from the sophisticated instruments used in the observations to derive an accurate value of Pluto's atmospheric pressure at its surface.
• It was found to be 12.23 ubar -- 80,000 times less than the atmospheric pressure at mean sea level on Earth. They also found that the pressure at the surface is close to the seasonal peak of Pluto.

Hence option 3rd is correct.