Which of the following can be used to demonstrate the intercondyloid fossa?
1. prone, knee flexed 40 degrees, CR directed caudad 40 degrees to the popliteal fossa
2. supine, IR under flexed knee, perpendicular to tibia
3. prone, patella parallel to IR, heel rotated 5 to 10 degrees lateral, CR perpendicular to knee joint
1 and 2 only