Which statements describe guaranteed behavior of the garbage collection and finalization mechanisms？（）  

• A、Objects are deleted when they can no longer be accessed through any reference.
• B、The finalize（） method will eventually be called on every object.
• C、The finalize（） method will never be called more than once on an object.
• D、An 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.
• E、The garbage collector will use a mark and sweep algorithm.