Which of these is not correct about the first principle?

Lagos State University MAT102 2014 past question

1. dy/dx = [f(x+h) - f(x)]/x
2. dy/dx = [f(x-h) + f(x)]/h
3. dy/dx = lim_{h→0} {[f(x+h) - f(x)]/h}
4. dy/dx = lim_{x→0} {[f(x+h) - f(x)]/x}

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