The best definition for the term "peer review" is when research is scrutinized and re-tested by others who are experts in the same area. Thus, the correct option is A.
Peer review signifies the evaluative feedback that focuses more on the strengths and field of improvements in your research.
Peer is the word that indicates the people of some common identities, background, age, etc. Peer review is the methodology for evaluating the work by more than two people with similar competencies.
Therefore, the correct option for this question is A.
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