How does the ARM Band Steering feature encourage 5GHz capable clients to move/connect to the 5GHz radios of Aruba APs?

How does the ARM Band Steering feature encourage 5GHz capable clients to move/connect to the 5GHz radios of Aruba APs?
A . ARM suppresses the probe responses on the 2.4 ghz radio?
B . ARM utilizes third party software on the wireless clients
C . Current Wi-Fi chipset firmware supports this by default
D . It’s not possible the move clients to 5GHz radios when they can see both 2.4 and 5GHz APs
E . ARM disables the 2.4Ghz radio for the specified client

Answer: A