Question 8 Which of the following statements is true? Spinlocks should be used only on single processor svstems. Spinlocks should be used only on multiprocessor systems Spinlocks can be used to prevent busy waiting in the implementation of semaphore. A counting semaphore can never be used as a binary semaphore Question 9 there are four coonerati processes assime P1 and P2 do not share an input de