Let f be differentiable function satisfy...

Let f be differentiable function satisfying `f((x)/(y))=f(x) - f(y)"for all" x, y gt 0`. If f'(1) = 1, then f(x) is

`2 log_(e) x`

`3 log_(e) x`

`log_(e) x`

`(1)/(2)log_(e)x`

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