Which controller access point is connecting to?

[#1]

Access point is on local mode but I couldn't find it on the local WLC.  AP shows active WiFi connection.  How do I find out which controllers it connects to? 

[Leo Laohoo]

Three ways of doing this:  

1.  Check PI for details; 

2.  Check every controller using GUI or CLI; and

3.  Log into the AP and do a "sh log".