Regarding the description of RRC establishment success rate, which of the following options is wrong?

Regarding the description of RRC establishment success rate, which of the following options is wrong?
A . Reflecting the UE’s admission capability of the eNB or the cell
B . The successful establishment of the RRC connection means that the UE establishes a signaling connection with the network.
C . RRC connection establishment can be divided into two cases: one is the RRC connection establishment related to the service; the other is the RRC connection establishment irrelevant to the service (such as emergency call, inter-system cell reselection, registration, etc.)
D . Service-Independent RRC connection establishment is an important indicator to measure the call completion rate. The service-related RRC connection establishment can be used to investigate the system load situation.

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Answer: D