Which of the Following Describes Intrasubject Counterbalancing in an Experiment

Multiple Choice

Which of the following describes intrasubject counterbalancing in an experiment with two experimental conditions, A and B?

A) half the participants experience one condition A) , and the other half experience the other conditionB)
B) half the participants experience condition one first followed by condition two AB) , while the other half gets the conditions in the reverse order BA)
C) each participant experiences condition A first, then condition B AB)
D) each participant experiences the following: condition A, condition B, condition B again, and condition A again ABBA)