The General Term of a Sequence Is Given $$a _ { n } = \frac { ( - 1 ) ^ { n - 1 } } { 7 n } ; S _ { 4 }$$

Multiple Choice

The general term of a sequence is given. Find the indicated partial sum.
- $$a _ { n } = \frac { ( - 1 ) ^ { n - 1 } } { 7 n } ; S _ { 4 }$$

A) $\frac { 25 } { 84 }$
B) $- \frac { 25 } { 84 }$
C) $\frac { 1 } { 12 }$
D) $- \frac { 1 } { 12 }$