Explanation:

1, 2, 3 and 4

National Commission for Women (NCW)

Formed via a statute: Yes. The National Commission for Women was established by an Act of Parliament in 1990.

National Commission for Minorities (NCM)

Formed via a statute: Yes. The National Commission for Minorities was established by the National Commission for Minorities Act, 1992.

National Human Rights Commission (NHRC)

Formed via a statute: Yes. The National Human Rights Commission was established by the Protection of Human Rights Act, 1993.

National Commission for Protection of Child Rights (NCPCR)

Formed via a statute: Yes. The National Commission for Protection of Child Rights was established by the Commission for Protection of Child Rights Act, 2005.

Therefore, all the commissions mentioned (1, 2, 3, and 4) are formed via statutes.