Question: In a fully user level thread ( ULT ) model A . thread scheduling is done entirely by the thread library in user space. B

In a fully user level thread (ULT) model
A. thread scheduling is done entirely by the thread library in user space.
B. thread switching does not require kernel mode privileges.
C. porting an application is more difficult than with kernel threads.
D. a blocking system call blocks all threads in the process.

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