A semaphore currently has the value 3. A process that attempts to subtract 4 from this semaphore will:   options: A continue without waiting, producing a value of -1 for the semaphore B continue without waiting, producing a value of 0 for the semaphore C wait until the value of the semaphore has become at least 4 because some other process(es) increased the semaphore's value D wait until the value of the semaphore becomes exactly 4 because some other process(es) increased the semaphore's value

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Linux

An operating system (OS) is the software which manages hardware and resources, like CPU, storage and memory. The OS bridges the applications and hardware and makes the connections between all of your software and the hardware resources.