What strategy would a historian most likely use to determine whether a source is valid?

A historian would likely assess the source's credibility by examining its authorship, context, and purpose. They would consider the author's qualifications, any potential biases, and the time period in which the source was created. Additionally, cross-referencing the information with other reliable sources can help verify its accuracy and corroborate its claims. This multi-faceted approach ensures a thorough evaluation of the source's validity.