Which of the following statements are true. Select all correct answers. A: The wait method defined in the Thread class, can be used to convert a thread from Running state to Waiting state. B: The wait(), notify(), and notifyAll() methods must be executed in synchronized code. C: The notify() and notifyAll() methods can be used to signal and move waiting threads to ready-to-run state. D: The Thread class is an abstract class. the "correct" answers are B and C I do not understand answer B. You do not have to call these methods.