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Which of following statements about mutex lock is/are true? A : may block processes B: may make other processes busy waiting C: is software-based solution

Which of following statements about mutex lock is/are true?

A : may block processes

B: may make other processes busy waiting

C: is software-based solution

D: is hardware-based solution

I thought the answers would be A, B, C are true, but really not sure. Thanks for you help!

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