In the WAC+FIT AP networking architecture, the AP will go through multiple stages during the online process. The different stages are sorted in chronological order. Which one is the correct one?

In the WAC+FIT AP networking architecture, the AP will go through multiple stages during the online process. The different stages are sorted in chronological order. Which one is the correct one?
A . AP obtains IP address -> NAC detects whether AP software version needs to be upgraded -> AP and WAC establish CAPWAP tunnel -> AP goes online -> WAC sends service configuration to AP
B. AP obtains IP address -> AP and AC establish CAPWAP tunnel -> WAC checks whether AP software version needs to be upgraded -> WAC sends service configuration to AP -> AP goes online
C. AP obtains IP address -> AP and WAC establish CAPWAP tunnel -> AC detects whether the AP software version needs to be upgraded -> AP goes online -> WAC delivers service configuration to AP
D. AP obtains IP address -> AP and WAC establish CAPWAP tunnel -> AP goes online -> WAC sends service configuration to AP -> WAC checks whether AP software version needs to be upgraded
E. AP obtains IP address -> WAC detects whether the AP software version needs to be upgraded -> AP and WAC establish CAPWAP tunnel -> WAC sends service configuration to AP -> AP goes online

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Answer: C