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

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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