After line 8 runs, how many objects are eligible for garbage collection?

(a) 0

(b) 1

(c) 2

(d) 3

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public class X { public static void main(String[] args) { X X = new X(); X x2 = m1 (x); /* Line 4 */ X X4= new X(); x2 = x4; /* Line 6 */ doComplexStuff (); } } static X m1 (X mx) { mx = new X(); return mx; }