Which one of the following statements describes the relationship between the ResourceManager and the ApplicationMaster?

Which one of the following statements describes the relationship between the ResourceManager and the ApplicationMaster?
A . The ApplicationMaster requests resources from the ResourceManager
B . The ApplicationMaster starts a single instance of the ResourceManager
C . The ResourceManager monitors and restarts any failed Containers of the ApplicationMaster
D . The ApplicationMaster starts an instance of the ResourceManager within each Container

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Answer: A