Q20

19.(4 points) The one-to-one thread model does not allow another thread to run when another thread makes a blocking system call B) does not provide more concurrency than the many-to-one model C) does not have an overhead problem D) is implemented in Linux 20. (4 points) In order for a class to be defined as a Thread in Java, it must implement the interface and therefore define the method. 21. (3 points) Which of the following is NOT a benefit of using threads? A) B) C) D) thre a program may continue running even if part of it is blocked or performing a lengthy operation threads cannot share the memory and the resources of the process to which they belong by default threads are more economical to create and context-switch ads increase parallelism especially on multiprocessor architectures