QUESTION 4 (20 marks) a) At the Blue Hat security conference in February 2019, a Microsoft engineer revealed that around 70% of all the vulnerabilities in Microsoft products addressed through security updates each year are related to memory safety issues. Microsoft is currently experimenting with using the Rust system programming language to alleviate this problem. Evaluate why Rust's concept of ownership, borrowing, and lifetimes, ensure memory safety without garbage collection and relate this with operating system security? You may provide illustrations and sample codes. (6 marks) b) Explain how Rust can achieve fearless concurrency? (4 marks)