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Let f : { 1 , 2 , 3 , 4 } Z with f ( x ) = xmod 2 . Which one of

Let f:{1,2,3,4}Z with f(x)=xmod2. Which one of the following statements is true?
2 is the only pre-image of 0
2 and 4 are the only pre-images of 0
4 is the only pre-image of 0
1,2,3 and 4 are all pre-images of 0
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