If there is an NSA access failure, which of the following types of problems can be counted through performance indicators, and the corresponding failure reasons can be counted?

If there is an NSA access failure, which of the following types of problems can be counted through performance indicators, and the corresponding failure reasons can be counted?
A . eNodeB does not initiate gNodeB addition
B . gNodeB refuses to add request
C . UE reports without MR
D . Random access by the UE on the eNodeB side fails

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Answer: B