多选题What are four valid examples of polymorphic method calls？（）Ax.a2（）；Bz.a2（）；Cz.c1（）；Dz.a1（）；Ey.c1（）；Fx.a1（）；
多选题
What are four valid examples of polymorphic method calls？（）
A
x.a2（）；
B
z.a2（）；
C
z.c1（）；
D
z.a1（）；
E
y.c1（）；
F
x.a1（）；
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