Which of the following sequences is an arithmetic sequence?
- A$f(n) = an + b;\, n \in N$
- B$f(n) = k{r^n};\, n \in N$
- C$f(n) = (an + b)k{r^n};\, n \in N$
- D$f(n) = \frac{1}{a(n + \frac{b}{n})};\, n \in N$
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