单选题：A system is in a deadlock, if its resource allocation graph____.

A system is in a deadlock, if its resource allocation graph____.@[C](1)
A. contains a cycle
B. doesn’t contain a cycle
C. contains a cycle and there is just one instance of every resource
D. has at least one outgoing edge from any one of the process nodes




A.contains a cycle
B.doesn’t contain a cycle
C.contains a cycle and there is just one instance of every resource
D.has at least one outgoing edge from any one of the process nodes


答案：C