b) Based on figure in slide 19, the user program performs a series of WRITE calls interleaved with processing. Code segments 1, 2, and 3 refer to sequences of instructions that do not involve I/O. The WRITE calls are to an 1/O program that is a system utility and that will perform the actual 1/0 operation. 1/0 operation labelled 4 prepares the actual I/O operation. I/O operation labelled 5 is to complete the I/O operation. Using your own words, discuss the program timing for the following executions: Without interrupts ii. Short I/O wait Long I/O wait [1 mark] [1 mark] [1 mark] III. State one advantage OR one disadvantage for each execution. [1 mark each)