Find the Indicated Trigonometric Value in the Specified Quadrant $\frac { 9 } { \sqrt { 19 } }$

Multiple Choice

Find the indicated trigonometric value in the specified quadrant.

A) $\frac { 9 } { \sqrt { 19 } }$
B) $\frac { \sqrt { 19 } } { 10 }$
C) $\frac { 10 } { \sqrt { 19 } }$
D) $\frac { 9 } { 10 }$
E) Undefined