34. Which of the following statements about Java garbage 
    collection is a true statement?

Check all correct answers:
A. The following code will start the garbage collector:
   System.gc();
   Thread.yield();
B. Calling Runtime.getRuntime().gc() will probably start 
   the garbage collection mechanism, but there is no guarantee.
C. The garbage collection Thread has a low priority.
D. The method by which Java determines that a chunk of memory 
   is garbage is up to the implementer of the JVM.