Which of the following is most likely to be a primary data source: a. A sales invoice
b. A customer record
c. An expense report
d. A customer survey

d. A customer survey

Explanation:

Data collected by researchers for the first time for a specific study is primary data.  A customer survey is a method of collecting primary data. A customer survey gathers information on the research topic directly from respondents.

Primary data like surveys are costly and consume time to collect, unlike secondary data. Other methods of collecting primary data include administering questionnaires, direct or indirect personal interviews, field observations, and experiments.

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