Martial Art Most Effective in MMA?

Which martial art(s) do you think is the best and most effective in the MMA ?

(ex: BJJ, Boxing, Karate, Kickboxing, Muay Thai, and/or Wrestling)

-Scout

Source: http://ninjashoes.net/forum/showthread.php?71414-Martial-Art-Most-Effective-in-MMA&goto=newpost

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