1. What are the three main objectives of operating system? 2. The concept and difference between process and thread. 3. What is the difference between deadlock avoidance, detection and prevention. 4. Embedded operating system uC/OS-II provides two system tasks, namely Idle task and Statistical task. What are their functions. Based on C/OS-II, you need to design a program on our experimental platform. The program contains two tasks. Task 1 controls LEDO to be on for 1000ms and off for 500ms. Task 2 controls LED1 to be on for 500ms and off for 200ms. Note that the other parts have been completed, you only need to design the function void led0 task(void *pdata) of Task 1 and the function void led1_task(void *pdata) of Task 2. void led0 task(void *odata) { } void led1 task(void *pdata) }