Which of the following is correct about Census of India?

First Census of India was conducted in 1881 The first major modification was introduced in 1971 Census by bringing in two additional components viz; place of birth i.e. village or town and duration of residence (if born elsewhere) Further in 1981, additional information on place of last residence and duration of stay at the place of enumeration were incorporated. Information on reasons for migration were incorporated in 1991 Census.

First Census of India was conducted in 1881

The first major modification was introduced in 1961 Census by bringing in two additional components viz; place of birth i.e. village or town and duration of residence (if born elsewhere).Further in 1971, additional information on place of last residence and duration of stay at the place of enumeration were incorporated. Information on reasons for migration were incorporated in 1981 Census