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What is the proper way to defined a method that take two int values and returns their sum as an int value?

A. int sum(int first, int second) { first + second; }

B. int sum(int first, second) { return first + second; }

C. sum(int first, int second) { return first + second; }

D. int sum(int first, int second) { return first + second; }

E. void sum (int first, int second) { return first + second; }

Answer: D

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