请阅读下面的程序public class Demo {public static void sum(int a,int b){System.out.println("int:"+(a +b));}public static void sum(int a,float b){System.out.println("float:"+(a +b));}public static void sum(int a,double b){System.out.println("double:"+(a +b));}public static void main(String[]args){int a =10;long b =20;sum(a,b);}}下列选项中,哪一个是程序的运行结果: