（单选题）
You notice that a job in a chain has not completed on a nonconstrained RAC database. Which of these are valid reasons why that might occur？（）
A The job priority is 1 and the resource consumer group CPU emphasis allocation is a low percentage.
B The job affinity is to a service and one node in that service is unavailable.
C The job affinity is to an instance and that instance is unavailable.
D There is no service affinity.
E None of the above.
正确答案
答案解析
略
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