Explanation:

- The Kartarpur Corridor is a border corridor between India and Pakistan, connecting the Sikh shrine of Dera Baba Nanak Sahib in India to the Kartarpur Sahib Gurdwara in Pakistan.

- It allows Sikh pilgrims from India to visit the final resting place of Guru Nanak Dev without requiring a visa.

- Option 1: Narendra Modi

- Narendra Modi, the Prime Minister of India, inaugurated the Indian side of the corridor on November 9, 2019.

- Option 2: Amarinder Singh

- Amarinder Singh was the Chief Minister of Punjab at the time but did not inaugurate the corridor.

- Option 3: Ram Nath Kovind

- He was the President of India during the corridor's inauguration but did not perform the ceremony.

- Option 4: Manmohan Singh

- Former Prime Minister of India was present as a guest but did not inaugurate the corridor.