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 O B. I, II and II only OC II and IV only OD. 1, 11, III and IV O E None critical section is 1. the data area which is shared by multi processes II. the code area in a process which access data shared with other processes III. a software solution to process synchronization problem IV. is the area of which only one process can enter to read shared data to ensure a proper process synchronization implementation. Select one: O AI and II only OB. I, II, III and IV OC. I, II and IV only OD. I and IV only