Mr$.$ and Mrs$.$ Johnson are seeking help in dealing with their adolescent son's substance abuse. Mr$.$ and Mrs$.$ Johnson have a hard time explaining exactly what it is about their son's behavior that is so upsetting $($e$.$g$.,$ it is wrong to take drugs, drugs can be physically harmful, drugs can get him in trouble with the law$).$ At one of their meetings, the program leader asked "Well then, why don't you smoke pot with him at home?" This attempt to confuse Mr$.$ and Mrs$.$ Johnson through the use of paradox, suggests that they are most likely participating in which of the following programs: $$ Behavioral Parent Training Cognitive$-$Behavioral Therapy STEP Structural Family Therapy