For the following declarations of sum functions, which of the function calls will be successful without errors?

int sum(int, int);
float sum(float, float);
int sum(int, int, int);
double sum(double, double)
 

1. sum(10,20)
2. sum(2,3,4,5)
3. sum(10,2,3)

 
Options:
 

1. 1 & 2
2. 2 & 3
3. 1 & 3
4. All 1, 2, & 3