What kind of different Hindu religions are covered under the Hindu Minority and Guardianship Act, 1956?

Under Section 3(1)(a) of the Hindu Minority and Guardianship Act, 1956, the Act applies to any person who is a Hindu by religion in any of its forms or developments, including a "Virashaiva, a Lingayat or a follower of the Brahmo, Prarthana or Arya Samaj". It also applies to Buddhists, Jainas and Sikhs, and to other persons who are not Muslims, Christians, Parsis or Jews, so it is not confined to any one caste or sect.