At which line is the Vector object, created in line 4, first subject to garbage collection? : Questions « Java Source And Data Type « SCJP

1. SCJP
2. Java Source And Data Type
3. Questions

import java.util.Vector;

public class MainClass {
  public static void main(String[] args) {
    Vector v1 = new Vector(); // line 4
    Vector v2 = new Vector();
    v1 = null;                // line 6
    Vector v3 = v1;
    v1 = v2;                  // line 8
    v1.add("A");
    v1.add(v2);
    String s = (String) v1.elementAt(0);
    v1 = v2;                  // line 12
    v2 = v1;
    v1.add(s);
  }
}

A. Line 6
B. Line 7
C. Line 8
D. Line 12