In the following Java code, which call to sum() method is appropriate?

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answerhappygod
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In the following Java code, which call to sum() method is appropriate?

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class Output {  public static int sum(int ...x) { return; } static void main(String args[]) { sum(10); sum(10,20); sum(10,20,30); sum(10,20,30,40); } }
a) only sum(10)
b) only sum(10,20)
c) only sum(10) & sum(10,20)
d) all of the mentioned
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