Modeling With Logarithmic Functions

The intensity of an earthquake, $I$ , is a logarithmic function of its energy, $E$ . If $I(1000) = 3$ and $I(100000) = 5$ , which of the following functions could model this relationship?

$I(E) = 3 + \log(E/1000)$

$I(E) = 3 \cdot \log(E/1000)$

$I(E) = 3 + \frac{1}{2}\log(E/1000)$

$I(E) = 2 + \log(E/1000)$

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