Let $T_r$ be the $r$-th term of an arithmetic progression for $r = 1, 2, 3, \dots$. If for some positive integers $m$ and $n$,$T_m = \frac{1}{n}$ and $T_n = \frac{1}{m}$,then $T_{mn} = \dots$
- A$\frac{1}{mn}$
- B$\frac{1}{m} + \frac{1}{n}$
- C$1$
- D$0$
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