Can you trace these java problems, thank you in advance. Any explanation with some tips would be appreciated

12. public class Main { public static void main(String args[]) { Test t1 = new Test(); Test t2 = new Test (5); System.out.println(t1.x + t2.y); (a) 1 (b) 10 (c) 8 (d) None of the above class Test { public int x,y; public Test () { X = 1: y = 2; public Test (int x) { int y = 3; this.x = x; (a) 1 (b) 5 (c) 8 public class Main { public static void main(String args[]) { Test t1 = new Test (; Test t 2 = new Test (5); Test t3 = new Test ( 5 (d) None of the above , 7); System.out.println(t1.x + t2.y + t3.x); class Test { public int x,y; public Test () { x = 1; y = 2; public Test (int x, int y) { this.y = y; this.x = x