Which type of validity would be most appropriate to assess for a scale designed to measure uncertainty in illness?

Question

Quizplus · Accepted Answer

Construct validity is concerned with the essence of what an instrument is actually measuring, or its conceptual accuracy. Content validity is an expert judgment that an instrument adequately measures the attribute or phenomenon of interest. Criterion validity involves demonstrating the relationship between performance on an instrument and performance on some other criterion measure that is known to represent the concept or attribute of interest.

Which Type of Validity Would Be Most Appropriate to Assess