2. (30 points) What is a real-time system? (a) Identify some hard real-time systems, and for each, identify a few hard timing constraints. (b) Identify some soft real-time systems, and for each, identify a few soft timing constraints. 3. (50 points) The car engine management system (EMS) is a real-time embedded system. Read related online materials and find out major hardware components of the system (30 points) and how they interact with each other to ensure the best engine performance (20 points)