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Mutex compared with semaphore

In most RTOSes, what is a key difference between a mutex and a binary semaphore?

A.A mutex has an owner and supports priority inheritanceB.A semaphore can only be used before the scheduler startsC.A mutex can be given from an ISR, a semaphore cannotD.A semaphore always blocks forever when taken

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Mutex compared with semaphore

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