Consider a structure of the form
<pre>
 ___________      ___________
|   |   |   |    |  /|   |   |
| o |   | o----->| / |   | o |
|_|_|___|___|    |/__|___|_|_|
  |                        |
 _v_________      _________v_
|  /|   |   |    |  /|   |  /|
| / |   | o----->| / |   | / |
|/__|___|___|    |/__|___|/__|
</pre>
Can this structure be reclaimed using the reference count method?
Can it be reclaimed using the mark and sweep method?
Briefly explain your answers.