The correct answer is (a) Mahesh Das.
Banda Bahadur was born as Mahesh Das in 1600 in the village of Bhunder in the present-day district of Sangrur in Punjab, India. He was a Hindu Brahmin who was initially a disciple of Guru Tegh Bahadur, the ninth Sikh Guru. After the execution of Guru Tegh Bahadur by the Mughal emperor Aurangzeb in 1675, Mahesh Das became a Sikh and took the name Banda Singh Bahadur.
Banda Singh Bahadur led a rebellion against the Mughals in the late 17th century. He captured several important Mughal forts and cities, including Sirhind and Samana. He also defeated a Mughal army at the Battle of Chappar Chiri in 1705.
Banda Singh Bahadur was eventually captured by the Mughals in 1710 and executed in Delhi. He is considered a martyr by Sikhs and is remembered for his bravery and sacrifice.
The other options are incorrect.
(b) Lachhman Dev was a Hindu saint who lived in the 16th century. He is not related to Banda Singh Bahadur.
(c) Dwarka Das was a Sikh saint who lived in the 17th century. He is not related to Banda Singh Bahadur.
(d) Harnam Das was the name of Guru Har Rai, the seventh Sikh Guru. He is not related to Banda Singh Bahadur.