Given the following method,

public static int doSum(int a, int b)

{

if (a < 0)

a = -a;

if (b < 0)

b = -b;

return a + b;

}

the sequence of statements shown below produce what output?

int a = -10;

int b = -20;

int sum = doSum(a,b);

System.out.println (a + "," + b + "," + sum);

	a.	-10, -20, 30
	b.	-10, -20, -30
	c.	-10, 20, 30
	d.	10, -20, -30