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Question 5 5 pts In an alternate universe Bill Gates decides to make MS-DOS 1.0 a preemptive kernel in order to support multitasking. How should he protect critical sections on the IBM PC clones existing in the early 1980s? O atmic compare and swap spinlocks O busy waiting O disable interrupts during critical sections O use Peterson's algorithm Question 6 5 pts The value of a counting semaphore initialized with 1 is now-4. How many processes are waiting on it? Question 7 5 pts How should one protect very short critical sections in a preemptive kernel running on a multicore system? O O O disabling interrupts during critical sections using atomic operations using mutex locks with spinlocks