MANAGEMENT

Detailed explanation-1: -So the one which is not a source of secondary data is (D), questionnaires.

Detailed explanation-2: -Interview, Questionnaire and Observation (Option D) are NOT sources of secondary data.

Detailed explanation-3: -The common sources of the secondary data for social science include statements, the data collected by government agencies, organisational documents, and the data that are basically collected for other research objectives. However, primary data, by difference, are gathered by the investigator conducting the research.

Detailed explanation-4: -Surveys, interviews, focus groups and observation techniques are common sources of data in primary research. In secondary research, the researcher collects existing research materials through a number of sources like the internet, libraries and archives.