Explanation
Under the census or complete enumeration method, data are collected for examining the entire population, which includes complete count. Hence, correct answer is option A.
Secondary data is the second-hand information as it is not collected by the user. Thus, secondary data refers to the data which is already collected and published by other authorities. For example, government census report is a secondary data. Hence, correct answer is option B.
When the investigator himself does not make any investigation and rather uses the data which has been collected by some other researcher such data is known as secondary data. The sources of collecting secondary data are:(i) published sources like newspapers, articles, blogs, etc. (ii) unpublished sources like unpublished news, etc.Hence, the correct answer is option D.
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