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Willi WerkelWilli Werkel 

Trailhead Challenge: Debugging Your (Lightning) Components

The challenge asks you how to put a message into the JS console and expects $A.log() as a valid answer.
This does however NOT write anything in the console if you are in PROD or PRODDEBUG mode. As I haven't seen any indicatiuon how to get into another mode I would regard this answer as wrong (same for $A.warning()