On the topological map of HUAWEI CLOUD application operation and maintenance, different colors represent the health of the instance, and the color is determined by the Apdex value. The closer the Apdex value is to 1 , the healthier the application. If an application instance is not called by other applications, its color is ()

On the topological map of HUAWEI CLOUD application operation and maintenance, different colors represent the health of the instance, and the color is determined by the Apdex value. The closer the Apdex value is to 1 , the healthier the application. If an application instance is not called by other applications, its color is ()
A . Green
B . Gray
C . Yellow
D . Red

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Answer: B