Use the Given Information to Find the Exact Value of the Expression

Multiple Choice

Use the given information to find the exact value of the expression.
- $\sin \alpha = \frac { 3 } { 5 } , \alpha$ lies in quadrant II, and $\cos \beta = \frac { 2 } { 5 } , \beta$ lies in quadrant I $\quad$ Find $\cos ( \alpha - \beta )$ .

A) $\frac { - 8 + 3 \sqrt { 21 } } { 25 }$
B) $\frac { 6 + 4 \sqrt { 21 } } { 25 }$
C) $\frac { 6 - 4 \sqrt { 21 } } { 25 }$
D) $\frac { 8 - 3 \sqrt { 21 } } { 25 }$