Which feature allows the legacy clients to connect while still allowing other clients to use fast transition based on their OUIs?

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An engineer configures a WLAN with fast transition enabled. Some legacy clients fail to connect to this WLAN.

Which feature allows the legacy clients to connect while still allowing other clients to use fast transition based on their OUIs?
A . over the DS
B . 802.11k
C . adaptive R
D . 802.11v

Answer: C