Find the General Term $a_n$ , of the Given Geometric Sequence
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Multiple Choice

Find the general term, $a_n$ , of the given geometric sequence
- $1, \frac{1}{7}, \frac{1}{49}, \ldots$

A) $a_{n}=\frac{1}{7^{1-n}}$

B) $a_{n}=\frac{1}{7(n-1) }$

C) $a_{n}=1-\left(\frac{6}{7}\right) ^{n}$

D) $a_{n}=\frac{1}{7^{n-1}}$