why is opt-F12 opening system preferences?

[Rolomoto]

opt-F12 opens system preferences but I can't find that shortcut listed anywhere in keyboard under system preferences. How is this happening and can I change it?
Thanks

 

[bogdanw]

"Solution: Go to Keyboard Preference check "Use all F1, F2 etc. keys as standard function keys""
from https://discussions.apple.com/thread/2206709