Find a General Term an for the Geometric Sequence $$a _ { 1 } = 4 , r = \frac { 4 } { 5 }$$

Multiple Choice

Find a general term an for the geometric sequence.
- $$a _ { 1 } = 4 , r = \frac { 4 } { 5 }$$

A) $a _ { n } = 4 ^ { n - 1 } - \frac { 16 } { 5 }$
B) $a _ { n } = 4 - \frac { 16 } { 5 } ( n - 1 )$
C) $a _ { n } = 4 + \frac { 1 } { 5 } ( n - 1 )$
D) $a _ { n } = 4 \cdot \left( \frac { 4 } { 5 } \right) ^ { n - 1 }$