多項選擇題

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; }

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