Which of the following will create a String different from the other three?

a. String r = "123456"
b. int i = 123;
int j = 456;
String r = String.valueOf(j) + String.valueOf(i);
c. int i = 123;
int j = 456;
String r = String.valueOf(i) + String.valueOf(j);
d. int i = 123;
int j = 456;
String r = i + j;

b. int i = 123;
int j = 456;
String r = String.valueOf(j) + String.valueOf(i);