How does an AP perform band steering to encourage clients to use 5 GHz?

The client devices that connect to your network include a mix of dual-band 802.11n and 802.11ac, single-band 802.11b/g/n, and some 802.11a/g/n. Your access points are configured with the same SSID on both the 2.4 and 5 GHz bands. The APs are also configured to prioritize client connectivity to 5 GHz.

How does an AP perform band steering to encourage clients to use 5 GHz?
A . When the client sends a probe request in the 2.4 GHz band, the AP may reply with information about the 5 GHz BSS.
B . The AP may ignore the initial probe requests or 802.11 authentication requests sent in the 2.4 GHz band by dual-band clients
C . The AP may allow an 802.11 association with the client in the 2.4 GHz band, then send unicast channel switch announcements to the client announcing the 5 GHz channel as the new channel.
D . After receiving probe request frames from the same client in both bands, the AP may send an association request frame to the client in the 5 GHz band.
E . The AP may allow an 802.11 association with the client in the 2.4 GHz band, then the AP may perform a transparent client handoff by transferring the client’s MAC address to the 5 GHz radio.

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Answer: B