For the Given General Term An, Write an Expression Using $\Sigma$

Multiple Choice

For the given general term an, write an expression using $\Sigma$ to represent the indicated p to represent the indicated partial sum.
- $a _ { n } = 2 - 6 n,$ third partial sum

A) $\sum _ { i = 1 } ^ { n } 2 - 6 i$
B) $\sum _ { i = 1 } ^ { 3 } 2 - 6 i$
C) $\sum _ { i = 0 } ^ { 2 } 2 - 6 i$
D) $\sum _ { i = 0 } ^ { 3 } 2 - 6 i$