An engineer must implement intrusion protection on the WLAN. The AP coverage is adequate and on-channel attacks are the primary concern. The building is historic, which makes adding APs difficult. Which AP mode and submode must be implemented? 

Answer options:

A. AP mode: local, AP submode: none
B. AP mode: monitor, AP submode: WIPS
C. AP mode: monitor, AP submode: none
D. AP mode: local, AP submode: WIPS

D