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Examples of data are given below : 1. ...

Examples of data are given below :
1. Information on households collected by an investigator by door-to-door visits.
2. Data on the percentage of literates, sex-wise, for the different districts of a state collected from records of the cenus of India.
3. General information about families, collected by telephonic interviews.
Which of the following in respect of the above is correct ?

A

Only -1 and 2 are primary data

B

Only 1 and 3 are primary data

C

Only 2 and 3 are primary data

D

1, 2 and 3 are primary data

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