Use the Product Rule to Multiply $\sqrt { 10 x } \cdot \sqrt { 17 y }$

Multiple Choice

Use the product rule to multiply. Assume all variables represent positive real numbers.
- $\sqrt { 10 x } \cdot \sqrt { 17 y }$

A) $\sqrt { 10 x + 17 y }$
B) $170 x y$
C) $\sqrt { 27 x y }$
D) $\sqrt { 170 x y }$