What is the responsibility of a secondary WLC?

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What is the responsibility of a secondary WLC?
A . It shares the traffic load of the LAPs with the primary controller.
B . It avoids congestion on the primary controller by sharing the registration load on the LAPs.
C . It registers the LAPs if the primary controller fails.
D . It enables Layer 2 and Layer 3 roaming between Itself and the primary controller.

Answer: C