D is the answer.
With OKC, the client performs a standard 802.1X/EAP authentication on initial connection to the network. (Page 453 of CWNA-107 Study Guide).
If the device doesn't support Fast Roaming, then Pre-shared Key (WPA2-PSK or WPA2-Personal) is recommended because WPA-Enterprise without Fast Roaming can introduce delay during roaming because of its requirement for full re-authentication.
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