Write the Sum Using Summation Notation $$- 3 + 9 - 27 + 81$$

Multiple Choice

Write the sum using summation notation.
- $$- 3 + 9 - 27 + 81$$

A) $\sum _ { n = 1 } ^ { 4 } ( - 1 ) ^ { n _ { 3 } n }$
B) $\sum_{n=1}^{4}(-1) ^{n+1} 3^{n}$
C) $\sum _ { n = 1 } ^ { 4 } ( - 1 ) ^ { n + 1 } n$
D) $\sum _ { n = 1 } ^ { 4 } ( - 1 ) ^ { n _ { n } }$