Explanation:

- Option 1: Jitendra Singh – Known for his political career in India, he has held various ministerial roles. However, no known appointment to Telecommunications Consultants India Limited (TCIL).

- Option 2: Rajeev Kumar – This name is quite common and several individuals in various sectors may have this name. However, there's no record of someone by this name being appointed as CMD of TCIL in January 2021.

- Option 3: Sanjeev Kumar – This is the correct answer. Sanjeev Kumar was appointed as the Chairman and Managing Director of Telecommunications Consultants India Limited in January 2021.

- Option 4: Sarabjit Singh Sandhu – There is no known record of Sarabjit Singh Sandhu being appointed to this specific role in TCIL.