Use the Product Rule to Multiply $\sqrt { 3 x ^ { 3 } } \cdot \sqrt { 3 x ^ { 5 } }$

Multiple Choice

Use the product rule to multiply. Assume all variables represent positive real numbers.
- $\sqrt { 3 x ^ { 3 } } \cdot \sqrt { 3 x ^ { 5 } }$

A) $x^4 \sqrt { 6 }$
B) $3 \mathrm { x } ^ { 4 }$
C) $\sqrt { 9 x ^ { 8 } }$
D) $\sqrt { 3 x ^ { 4 } }$