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Polymorphism - Programming

Q1:

Which of the following is the correct way to overload + operator?

A 
public sample operator + ( sample a, sample b )

B 
public abstract operator + ( sample a, sample b)

C 
public abstract sample operator + (sample a, sample b )

D 
public static sample operator + ( sample a, sample b )

E All of the above

ANS:D - 

public static sample operator + ( sample a, sample b )

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