probability issues

Manufactuer is testing 4 brands of soda in a blind taste test. The participants know brands being tested but do not know which is which. What is the probability that a participant will identify all 4 brands correctly by guessing
A. .4 B. .04 C. .1 D .01
\(\displaystyle \dfrac{1}{4!}=0.041666666666666666666666666666666666666666666666\) SEE HERE

 
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