As per the Protection of Human Rights Act, 1993 (and amendments prior to 2019), the National Human Rights Commission's composition included: a Chairperson who must be a former Chief Justice of the Supreme Court (not a High Court CJ or an SC Judge, as the sole eligibility criterion for the Chairperson was former CJI status) - making statement 1 incorrect. It included one member who is or has been a Judge of the Supreme Court (Statement 2 - Correct), one member who is or has been the Chief Justice of a High Court (Statement 3 - Correct), and two members with knowledge or practical experience in human rights matters (Statement 4 - Correct, as per the pre-2019 Act). Therefore, statements 2, 3, and 4 accurately describe the composition during a significant period of the NHRC's existence.