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多项选择题 class One {   public One foo() { return this; }  }  class Two extends One {  public One foo() { return this; }  }  class Three extends Two {   // insert method here  }  Which two methods, inserted individually, correctly complete the Three class?()

A、 public void foo() { }

B、 public int foo() { return 3; }

C、 public Two foo() { return this; }

D、 public One foo() { return this; }

E、 public Object foo() { return this; }

  • C,D
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