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Which two statements are true？（）
A:It is possible for more than two threads to deadlock at once.
B:The JVM implementation guarantees that multiple threads cannot enter into a deadlocked state.
C:Deadlocked threads release once their sleep（） method’s sleep duration has expired.
D:Deadlocking can occur only when the wait（）， notify（）， and notifyAll（） methods are used incorrectly.
E:It is possible for a single-threaded application to deadlock if synchronized blocks are used incorrectly.
F:If a piece of code is capable of deadlocking， you cannot eliminate the possibility ofdeadlocking by insertinginvocations of Thread.yield（）.

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出自：Oracle认证

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