The information that most readers are likely to know sources would NOT need formal acknowledgment in your paper. Thus, option (a) is correct.
What is sources?
The term sources refers to the place, person and things can be originated by actually happening. The sources are records and realistic based not fake. The source is most important to developed new research. The source are such kind of important in journalism. without sources research is impossible.
The formal acknowledgment in paper to represent the information related to research. The source in direct quotation basis and assist or guide to another person. The share opinion to another person. But not acknowledgment to another person to information that most of the reader already know.
Therefore, option (a) is correct.
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