Explanation:

Bernardinelli-Bernstein Comet

• National Aeronautics and Space Administration’s (NASA) Hubble Space Telescope has confirmed that the huge Bernardinelli-Bernstein comet is indeed the largest icy comet nucleus ever seen by astronomers. Hence statement 1st is incorrect.
• This comet has an estimated diameter of almost 129 kilometres.
• The nucleus is around 50 times larger than that of most known comets, and its mass is estimated to be around 500 trillion tonnes.
• The Bernardinelli-Bernstein comet has been travelling towards the sun for over a million years and it is believed to have originated in the Oort Cloud, a distant region of the solar system that is predicted to be the source of most comets.
• The Bernardinelli-Bernstein comet follows a 3-million-year-long elliptical orbit and has an estimated temperature of minus 348 degrees Fahrenheit – warm enough to sublimate carbon monoxide from the surface to produce the dusty coma.

Hence only statement 2nd is correct.