A.They pass messages by modifying each other’s member variables
B.They pass messages by modifying the static member variables of each other’s classes
C.They pass messages by calling each other’s instance member methods
D.They pass messages by calling static member methods of each other’s classes.

A.One object is created
B.Two objects are created
C.Three objects are created
D.One reference variable is created
E.Two reference variables are created
F.Three reference variables are created.