Which statement is true about the following figure while ensuring the code continues to compile? (Choose two.) 

A.  can be inserted at positions P and R without making any other changes.

B.  can be inserted at positions Q and S without making any other changes.

C.  can be inserted at all four positions.

D. Both variables point to an ArrayList.

E. Only one variable points to an ArrayList.

F. Neither variable points to an ArrayList.

List balloons P var air = R new ArrayList, (); new ArrayList (); S Q