In a small campus WLAN networking scenario, in the CAPWAP tunnel establishment process, which of the following steps may not be performed by the AP and AC?

In a small campus WLAN networking scenario, in the CAPWAP tunnel establishment process, which of the following steps may not be performed by the AP and AC?
A . AP and AC exchange echo packets
B. AP and AC exchange join messages
C. AP and AC exchange image data packets
D. AP and AC exchange keepalive packets

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Answer: C