For WLAN survey outdoor bridge scene, which of the following content is need to pay attention to? (Multiple Choice)
A . Whether the transmission path of the bridge link is blocked, mark the latitude and longitude of the station
B . For the site to observe the AP and antenna installation
C . Each site needs to be concerned about the location of the weak current room
D . Whether to add a relay between the leaf site and the aggregation site or not
Answer: ABD