What is the most likely cause of the unpredictable client band selection behavior?

ABC Company has a 2.4 and 5 GHz WLAN deployment. DFS functionality is enabled as required by the regulatory domain and APs use DFS channels as long as radar is not detected. Band steering is also enabled to encourage dual-band clients to use frequency bands with more capacity.

Your performance analysis shows that many dual-band VoWiFi client devices will move back and forth between 2.4 and 5 GHz as the users roam throughout the building. All APs have 2.4 and 5 GHz radios enabled with transmit power adjusted to accommodate relatively similar cell sizes. This “band hopping” behavior is viewed by network staff to be undesirable.

What is the most likely cause of the unpredictable client band selection behavior?
A . Interference from 5 GHz radar sources has increased frame corruption and retries on channels 36- 48.
B . 5 GHz frequencies offer better RF penetration than 2.4 GHz, but 2.4 GHz offers more voice call capacity and lower latency than 5 GHz.
C . The voice client does not support DFS, and therefore experiences some 5 GHz coverage holes as it moves through the network.
D . The client’s band selection algorithm prefers 5 GHz, but band steering behavior usually steers 75- 85% of client devices to 2.4 GHz.

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Answer: C