Which statement about configuration of Layer 2 wireless user authentication on a Cisco WLC is true?

Which statement about configuration of Layer 2 wireless user authentication on a Cisco WLC is true?
A. Local EAP is used only if an external RADIUS is not configured or is unreachable.
B. The external RADIUS is used only if local EAP is not configured.
C. The administrator chooses whether local EAP or an external RADIUS is used first.
D. Theexternal RADIUS is used only if local EAP is explicitly disabled.