Explanation:

- Radha Krishna Mathur (RK Mathur): He was appointed as the first Lieutenant Governor of Ladakh when it became a Union Territory on October 31, 2019. Highlighting his role, he's a retired 1977-batch IAS officer of the Tripura cadre.

- Sudhir Bhargava, Satyananda Mishra, Sanjay Mitra, and G. Mohan Kumar: These individuals have held various significant positions in government but are not linked to the role of Lieutenant Governor of Ladakh.

- Correct Answer: Option 2 - RK Mathur

RK Mathur's appointment marked an important transition for Ladakh as it gained Union Territory status. He’s vital for administrative setup and development in this region.