Write a Formula for the General Term (The Nth Term) $4 , - \frac { 4 } { 3 } , \frac { 4 } { 9 } , - \frac { 4 } { 27 } , \frac { 4 } { 81 } , \ldots$

Multiple Choice

Write a formula for the general term (the nth term) of the geometric sequence.
- $4 , - \frac { 4 } { 3 } , \frac { 4 } { 9 } , - \frac { 4 } { 27 } , \frac { 4 } { 81 } , \ldots$

A) $a _ { n } = 4 \left( - \frac { 1 } { 3 } \right) ^{ n - 1}$
B) $a _ { n } = 4 \left( - \frac { 1 } { 3 } \right) ^n$
C) $a _ { n } = 4 \left( - \frac { 1 } { 3 } \right) ^{ n + 1}$
D) $a _ { n } = 4 \left( - \frac { 1 } { 9 } \right) ^ { n - 1 }$