1. Which of the following statements is incorrect? A) An operating system provides an environment for the execution of programs. B) An operating system manages system resources. C) Operating systems provide both command line as well as graphical user interfaces. D) Operating systems must provide both protection and security. 2. Which of the following is an inter-process communication that requires two processes share memory? A) message passing B) shared memory C) socket communication D) all of the above 3. Which of the following cases could force a process removed from the CPU? A) I/O request B) fork a child C) interrupt or time slice expired D) all of the above and state from 4. If process Pois switched to process P1, state for Po will be saved into will be reloaded? A) PCB, B) PCB, PCB1 C) PCB1, PCB D) PCB1, PCB1 5. Which of the following IPC mechanism is easier to implement in a distributed system? A) shared memory B message passing C) socket communication D) ordinary pipe