Answer:
The correct answer would be - Valid or reliable.
Step-by-step explanation:
The validity or reliability of a study is a measure of an experiment or studies that helps in to check or test if a study is correct or not. It helps in the determination of the study method and explanation of the phenomena of particular study.
The reliability or validity of a study can be established by same results or conclusions by repeating the study or experiment every time.
Thus, the correct answer is - valid or reliable.