Hi teacher, can u help me answer all the question? If your answer is true I will upvote you Q2 The fact that a system has a register where CPU will keep on checking for the status of device tells us that the process involve Select one: O A program controlled I/O O B. memory mapped I/O OC polling OD. Direct Memory Access Q3 Which statement(s) below is(are) TRUE about critical section (CS) 1. CS is the data area which can only be accessed by a process at a time. II. Any CS solution must fulfil mutual exclusion requirement. III. Any CS solution must not allow no progress condition to happen IV. CS section control is also important when a single process and a single thread is involved. Select one: O A II and III only OB. I, II, III and IV only OC. I, II and III only D. I and II only O E. None of the above. Q4 Which of the following statement(s) describe DMA transfer correctly? 1. 1/0 transfer using DMA removes the need for interrupt to CPU over all until 0 interrupt is required to CPU. II. DMA takes over the bus during I/O transfer operation from CPU until all data transferred than CPU will be acknowledged and bus control released. III. DMA will involve a DMA device driver to interact on behalf of the OS with the CPU. IV. DNA operation is controlled by a DMA controller. Select one: O AI and II only OB. I, II and II only OC II and IV only OD. 1, l, lll and IV OE None