QUESTION 20 A Process Control Block (PCB) does not contain which of the following? pointer to code. process state. bootstrap program. pointer to open files. QUESTION 21 In C/UNIX, what system call creates a new process? O fork() create() new() exec() QUESTION 22 In a time-sharing operating system, when the time slot given to a process is completed, the process goes from the running state to the O blocked state. O ready state. suspended state. O waiting state. QUESTION 23 Which of the following requires a device driver? O A register. O A cache. Main memory. O A disk.