Trace: return value (Java)

Line 1: public static void main(String[] args) {1public static void main(String[] args) {
Line 2, indented 1 level: int a = 3;2    int a = 3;
Line 3, indented 1 level: int b = addOne(a);3    int b = addOne(a);
Line 4, indented 1 level: int c = addOne(b);4    int c = addOne(b);
Line 5, indented 1 level: System.out.println(c);5    System.out.println(c);
Line 6: }6}
Line 7: 7
Line 8: static int addOne(int x) {8static int addOne(int x) {
Line 9, indented 1 level: return x + 1;9    return x + 1;
Line 10: }10}

Fill in one row each time a line changes a, b or c, or prints something. The table already has the right number of rows. In each row, write only what that line changes; you can leave the other cells empty or copy their values down. Write values the way Java shows them: 3 and 3.0 are different, and text goes in quotes. In the output column, write exactly what appears on screen, with no quotes around it.