4. Nationality, Domicile and Character of Candidates Appointed to the Service.

(a) a citizen of India, or
(b) a subject of Nepal, or
(c) a subject of Bhutan, or
(d) A Tibetan refugee who came over to India before Ist January, 1962, with the intention of permanently settling in India, or
(e) a person of India origin who has migrated from Pakistan, Burma, Shri Lanka, East African Countries of Kenya, Uganda, the United Republic of Tanzania (formerly Tanganyika and Zanzibar), Zambia, Malawi, Zaire and Ethiopia with the intention of permanently settling in India :