Which of the following is the best action for the internal auditor to take before drawing a conclusion?

An internal auditor collected several employee testimonials.

Which of the following is the best action for the internal auditor to take before drawing a conclusion?
A . Ensure the testimonials are well documented
B. Substantiate the testimonials with physical or documentary evidence
C. Corroborate testimonials with the results from other soft control techniques
D. Review the testimonials with the interviewed employees

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Answer: C