1. Which of the following components of an operating system maintains the directory system? B. File manager 2. A section of a program that should be executed by at most one process at a time is called a A. Device drivers C. Memory manager A. Utility B. Critical region C. Privileged instruction S. Which of the following is not an attempt to provide security? A. Passwords . Privilege levels C. Multitasking 4. Which of the following events is detrimental to an operating system's performance? A. Deadlock B. Interrupt C. Booting 5. Which of the following is a technique for controlling access to a critical region? B. Time sharing 6. Which of the following is not involved in a context switch? B. Process table A. Spooling C. Semaphore D. Booting A. Interrupt C. Dispatcher D. User Interface 7. Which of the following concepts is not associated with critical regions? A. Semaphores B. Mutual exclusion C. Bootstrap . Which of the following is not a role of a typical operating system? A. Control the allocation of the machine's resources B. Control access to the machine C. Maintain records regarding files stored in mass storage D. Assist the computer user in the task of processing digital photographs Which of the following is a task that is not performed by the kernel of an operating sys A. Communicate with the user C. Allocate resources B. Schedule processes D. Avoid deadlock