Which statements describe guaranteed behavior of the garbage collection and finalization mechanisms？（）
- AObjects are deleted when they can no longer be accessed through any reference.
- BThe finalize（） method will eventually be called on every object.
- CThe finalize（） method will never be called more than once on an object.
- DAn object will not be garbage collected as long as it is possible for an active part of the program to access it through a reference.
- EThe garbage collector will use a mark and sweep algorithm.