Which statement about Link Aggregation when implemented on a Cisco Wireless LAN Controller is true?

Which statement about Link Aggregation when implemented on a Cisco Wireless LAN Controller is true?

A. To pass client traffic two or more ports must be configured B. The EtherChannel must be configured in “mode active” C. When enabled, the WLC bandwidth drops to 500 Mbps D. One functional physical port is needed to pass client traffic