多选题Given: Which three are valid?（）Ap0 = p1;Bp1 = p2;Cp2 = p4;Dp2 = (ClassC)p1;Ep1 = (ClassB)p3;Fp2 = (ClassC)p4;
题目
多选题
Given: 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;
p0 = p1;
p1 = p2;
p2 = p4;
p2 = (ClassC)p1;
p1 = (ClassB)p3;
p2 = (ClassC)p4;