A researcher is interested in whether self-confidence increases dominance. She has a group of employees complete a self-report measure of dominance. She then has the employees complete a series self-confidence boosting exercises and has them complete the same dominance measure again. Because they completed the self-report dominance measure earlier, they recognize what it measures and change some of their answers to appear more dominant. What threat to validity should the researcher be concerned about? Question 45 options: Regression Maturation Instrumentation Testing