5. (1 point) In 1-2 sentences, describe a situation where the pipe system call might fail. 6. (4 points) In 1-2 sentences, explain the risk of having too many queues in a multi-level feedback queue (2 points). In 1-2 sentences, explain the risk of having too few queues in a multi-level feedback queue (2 points). 7. (2 points) We observed that cooperative multitasking with processes did not work. That said, user-level threading packages (like pthread) generally are cooperatively scheduled. Explain in 1-2 sentences why user-level threading packages generally use a cooperative scheduling ap- proach. 8. (2 points) In 1-2 sentences explain how an Os using a multi-level feedback queue scheduling policy might distinguish between "interactive" and "non-interactive" jobs