Explanation:

All three statements are correct.

• Section 6A of the Citizenship Act, 1955 was a special provision inserted due to the Assam Accord. It establishes March 24, 1971, as the crucial date for determining citizenship eligibility in Assam. 

• Recent rules associated with the Citizenship Amendment Act (CAA), 2019 aim to streamline citizenship for specific religious minorities from Pakistan, Bangladesh, and Afghanistan. One key change is the removal of the need for a passport from their home country or an Indian visa. Instead, “any document” that shows one of the parents, grandparents or even great-grandparents of the applicant were from one of these countries is sufficient to prove their nationality. Additionally, a certificate issued by an elected member of a local body can be a replacement for a visa. 

• The Assam Accord of 1985 aimed at addressing the issue of illegal immigration into Assam, protecting the cultural, social, and economic identity of the local people, and ensuring their political rights. Section 6A of the Citizenship Act was introduced to give effect to the Assam Accord. It provides the framework to recognise migrants in Assam as Indian citizens or to expel them based on the date of their migration. 

Hence option 3rd is correct.