Find the Exact Value of Csc ?,Using the Triangle Shown $a = 4$

Multiple Choice

Find the exact value of csc ?,using the triangle shown in the figure below,if $a = 4$ and $b = 3$ .

A) ? $\frac { 3 } { 5 }$
B) ? $\frac { 4 } { 3 }$
C) ? $\frac { 5 } { 4 }$
D) ? $\frac { 4 } { 5 }$
E) ? $\frac { 5 } { 3 }$