What condition will prevent a dual-band VHT/HT client device from performing a fast and seamless transition (i.e. latencysensitive applications are not disrupted) between two access points that are managed by the same WLAN controller?

In an enterprise WLAN, what condition will prevent a dual-band VHT/HT client device from performing a fast and seamless transition (i.e. latencysensitive applications are not disrupted) between two access points that are managed by the same WLAN controller?
A. The current AP is using channel 1 and the new AP is using channel 40.
B. The SSID of the current AP does not match the SSID of the new AP.
C. The current AP supports only HT and the new AP is VHT capable.
D. The access points are hiding the SSID in Beacons and Probe Response frames.

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