If an experiment had four conditions (A, B, C, and D) and each participant is to be measured under each condition, intragroup incomplete counterbalancing might be the best method to use. Which of the following describes this method?

I: ABDC; Group
II: BCAD; Group
III: CDBA; Group
IV: DACB Group

I: ABCD; Group
II: BCDA ;Group
III: CDAB; Group
IV: DABC ABCDDCBA ABCD