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I need some help with this question, I don't know where to start...

The function f(x) is continuous over 0<=x<infinity and satisfy:

\[\lim_{x\to\infty }f(\frac{1}{ln(x)})=0\]

which conclusion is correct:

1. f(x)=1/ln x

2. f(x)=x

3. f(0)=0

4. f(infinity)=0

5. f(1) = infinity

thanks !