Types of validity include __________ validity.

A) predictive
B) content
C) construct
D) all the answers

All three types of validity (predictive, content, and construct) are important in establishing the validity of a study's results. Predictive validity refers to the ability of a measure to predict future behavior or performance, content validity refers to the extent to which a measure covers all aspects of the construct being measured, and construct validity refers to the ability of a measure to actually measure the theoretical construct it is intended to measure. Therefore, all the answer choices are correct.