If $\mathop {\lim }\limits_{x \to 0} {{\log \left( {3 + x} \right) - \log \left( {3 - x} \right)} \over x}$ = k, the value of k is

Question

$ - {2 \over 3}$

$ - {1 \over 3}$

${2 \over 3}$

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