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Object Oriented Programming (OOPs)

Question : 19

Total: 72

Given:

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?

public void foo() {}
public int foo() { return 3; }
public Two foo() { return this; }
public One foo() { return this; }
public Object foo() { return this; }

Validate

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