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If the wait for graph contains a cycle ____________

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If the wait for graph contains a cycle ____________

(a) then a deadlock does not exist

(b) then a deadlock exists

(c) then the system is in a safe state

(d) either deadlock exists or system is in a safe state

The question was asked by my school teacher while I was bunking the class.

Question is taken from Deadlock Detection topic in portion Deadlocks of Operating System

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The correct answer is (b) then a deadlock exists

The best I can explain: None.

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