Explanation:

- Swami Vivekananda was an Indian Hindu monk and one of the most influential spiritual leaders of the 19th century.

- Option 2: Narendranath Dutta: This is the correct original name of Swami Vivekananda. He was born as Narendranath Dutta in 1863 in Kolkata.

- Option 1: Mula Sankara: This name doesn't relate to Swami Vivekananda. It appears to be a made-up name without historical significance to this context.

- Option 3: Vardhamana: This refers to Mahavira, the 24th Tirthankara in Jainism, not Swami Vivekananda.

- Option 4: Nrusimha Bhan: This name isn't associated with Swami Vivekananda either and does not have relevant historical significance.