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Which of the following correspondences c...

Which of the following correspondences can not be called a function ?
`f(x)=x^3;{-1,0,1}vec{-1,0,1,2,3}`
`f(x)=+-sqrt(x);{0,1,4}vec{-2,-1,0,1,2}`
`f(x)=sqrt(x);{0,1,4}vec{-2,-1,0,1,2}`
`f(x)=-sqrt(x);{0,1,4}vec(-2,0,1,2}`

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