Circle method signatures which will cause an error if all methods were defined in a single class (There are multiple answers to this question)

public int sum (int num1, int num2) {...}

public double sum (int num1, int num2) {...}

public int sum (double num1, int num2) {...}

public int sum (int num3, int num4) {...}

public int sum (int num1, int num2, int num3) {...}