Use Properties of Logarithms to Condense the Logarithmic Expression $$\frac { 1 } { 2 } \log _ { 9 } x + \log _ { 9 } y$$

Use properties of logarithms to condense the logarithmic expression. Write the expression as a single logarithm
whose coefficient is 1. Where possible, evaluate logarithmic expressions.
- $$\frac { 1 } { 2 } \log _ { 9 } x + \log _ { 9 } y$$

A) $\log _ { 9 } y \sqrt { x }$
B) $\log _ { 9 } \frac { \sqrt { x } } { y }$
C) $\log _ { 9 } \sqrt { x y }$
D) $\log _ { 9 } \sqrt { \frac { x } { y } }$