MFP is enabled globally on a WLAN with default settings on single controller wireless network. Older client devices are disconnected from the network during a deauthentication attack. What is the cause of this issue?

MFP is enabled globally on a WLAN with default settings on single controller wireless network. Older client devices are disconnected from the network during a deauthentication attack. What is the cause of this issue?

A. The client devices do not support WPA.

B. The client devices do not support CCXv5.

C. The MFP on the WLAN is set to optional

D. The NTP server is not configured on the controller.

Answer: C