1) Which of the following statements is correct? A) Operating systems include compilers for higher-level languages. B) Mobile operating systems often include middleware to provide additional services. C) I/O devices are essential components of the CPU in Von Neumann Architecture. D) CPU is heavily involved in the entire process of DMA data transfer to improve transmission efficiency. 2) Which of the following statements is correct? A) Main memory is categorized into non-volatile secondary storage in the storage system, which the CPU can directly access. B) Larger cache hit ratio usually leads to a longer average access time. C) In a symmetric multiprocessing system, the master processor often assigns specific tasks to the slave processors, and the master handles I/O. D) Different operating systems can run concurrently on a single physical machine with virtual machines