Add, First Finding the LCD $\frac { 4 } { 5 } + \frac { 1 } { 4 }$

Multiple Choice

Add, first finding the LCD. Simplify, if possible.
- $\frac { 4 } { 5 } + \frac { 1 } { 4 }$

A) $\frac { 5 } { 9 }$
B) $\frac { 7 } { 3 }$
C) $\frac { 1 } { 4 }$
D) $\frac { 21 } { 20 }$