Express the Sum Using Summation Notation $$\sum _ { k = 1 } ^ { 4 } \frac { 1 } { 7 k }$$

Multiple Choice

Express the sum using summation notation.
- $$\sum _ { k = 1 } ^ { 4 } \frac { 1 } { 7 k }$$

A) $\frac { 1 } { 28 }$
B) $\frac { 11 } { 42 }$
C) $\frac { 5 } { 28 }$
D) $\frac { 25 } { 84 }$