The value of \( \lim _{n \rightarrow \infty}\left(\frac{1}{n a}+\frac{1}{n a+1}+\frac{1}{n a+2}+...

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The value of \( \lim _{n \rightarrow \infty}\left(\frac{1}{n a}+\frac{1}{n a+1}+\frac{1}{n a+2}+\ldots+\frac{1}{n b}\right) \) is
(a) \( \log \left(\frac{a}{b}\right) \)
(b) \( \log \left(\frac{b}{a}\right) \)
(c) \( \log (a b) \)
(d) None of these
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