Let $a_1, a_2, ..., a_{10}$ be a $G.P.$ If $\frac{a_3}{a_1} = 25$,then $\frac{a_9}{a_5}$ is equal to:
- A$5^4$
- B$4(5^2)$
- C$5^3$
- D$2(5^2)$
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