Express the Sum Using Summation Notation $\sum _ { k = 3 } ^ { 5 } \left( k ^ { 2 } - 8 \right)$

Multiple Choice

Express the sum using summation notation.
- $\sum _ { k = 3 } ^ { 5 } \left( k ^ { 2 } - 8 \right)$

A) 15
B) 0
C) 26
D) $- 12$