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threads system dependent?

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Hi guys,

This is from enthuware:

What is guaranteed by the JVM about threads?
Choose two

1)Although in the end but all lower priority will be granted CPU time.

2)If a higher priority thread is in ready to run state then a lower priority
thread will not run till the higher priority thread ends.

3)CPU time is distributed to the threads according to thread priority.

4)Operating System decides which thread to run when and for how much time

5)Threads in Java are System dependent.

I thought 1) and 4) were right...
answer given: 4) and 5)

Threads in Java are System dependent...

but I somewhat vaguely remember reading something like threads in java are implemented by the jvm itself rather than the OS (unlike c or c++ )and that it provides for "portability"..?

protability vs System-dependent

why is 1) wrong? Because its not that CPU will be granted for lower priority processes only at the end??
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(1) is not even wrong. It's not even a grammatical English phrase and I can't guess a meaning for it (as a native speaker of English). Are you sure you copied it correctly? If you did, it doesn't say much for the place you got it from.
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