多项选择题
Given：
class ClassA {}
class ClassB extends ClassA {}
class ClassC extends ClassA {}
and：
ClassA p0 = new ClassA（）；
ClassB p1 = new ClassB（）；
ClassC p2 = new ClassC（）；
ClassA p3 = new ClassB（）；
ClassA p4 = new ClassC（）；
Which three are valid？（）
A.p0 = p1；
B.p1 = p2；
C.p2 = p4；
D.p2 = （ClassC）p1；
E.p1 = （ClassB）p3；
F.p2 = （ClassC）p4；
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