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Thread priority (examulator.com)

 
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I got this question on examulator

Which of the following statements are true?
Select 1 option

1) A higher priority Thread will prevent a lower priorty Thread from getting any access to the CPU.
2) The yield method only allows any higher priority priority thread to execute.
3) The Thread class has a static method called yield
4) Calling yield with an integer parameter causes it to yield for a specific time.


The correct answer was 3.
I think 1 and 3 should be the correct answer
This is a quote from Kathy & Berts book


The closest thing to a guarantee is that at any given time, when a thread is running it will usually not have a lower priority than any thread in the runnable state. If a low-priority thread is running when a high-priority thread enters runnable, the JVM will preempt the running low-priority thread and put the high-priority thread in.


Could someone please tell me if 1 is the correct answer also.
 
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My problem with 1 is that it is worded as an absolute. Exactly what happens is up to the JVM thread management and what the higher priority Thread is trying to do.
Note the "usually" in the quoted passage.
Bill
 
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