Which of the following is not correct about user-level threads? *1/1User-level threads are more efficient than kernel threads, in the sense that they do not need kernel calls to switch among threadsWith user-level threads, customized scheduling algorithms cannot be implemented User-level threads cannot be preempted by clock interrupts unless the whole process' quantum has been used upIf one user-level thread makes a blocking system call, the system will block the entire process (which contains that user-level thread)

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