Attached are the book, study guide and slides. In your words, answer these questions. Keep your answer short and simple. No need for a whole paragraph, 3 sentences are enough. How does the Byzantine generals problem relate to concurrency in distributed systems? How is mutual exclusion implemented in NFS?What is the job of the recovery manager in distributed transaction models?Name three challenges of mobile computing in today’s highly connected networkDescribe atomicity in transactions and how it is important?