7. A soft timer facility is used to maintain the timers in Table 1. Timer | A | B | C | D |E|F Expiry time (ms) 168 273 84 357 63 42 Table 1: Soft timers. The facility consists of an interrupt service routine (ISR) part and a worker task part. Assuming one tick in the real time clock corresponds to 7ms, what would you expect the semaphore of the ISR part to be initialised at? [5 marks] A. 0. B. 7. C. 3. D. 21. E. None of the above. 8. If the timers in Table 1 are implemented using a sorted timer list, what will the contents of the list be after 7 ticks of the clock? [5 marks A. 3, 5, 4. B. 8, 13, 4, 17, 3, 2. C. 1, 5, 4. D. 2, 1, 1, 4, 5, 4. E. None of the above