Find the Square Root $$\sqrt { 49 x ^ { 12 } }$$

Find the square root. Assume that all variables represent nonnegative real numbers.
- $$\sqrt { 49 x ^ { 12 } }$$

A) $49 x ^ { 6 }$
B) $7 x ^ { 6 }$
C) $7 x ^ { 12 }$
D) $7 x ^ { 2 }$