Perform the Indicated Operations $$\left( 9 \mathrm { k } ^ { 2 } \mathrm {~m} ^ { - 4 } \right) ^ { 1 / 2 }$$

Multiple Choice

Perform the indicated operations. Write the answer using only positive exponents. Assume all variables represent
positive real numbers.
- $$\left( 9 \mathrm { k } ^ { 2 } \mathrm {~m} ^ { - 4 } \right) ^ { 1 / 2 }$$

A) $\frac { 2 k } { m ^ { 2 } }$
B) $2 \mathrm {~km} ^ { 2 }$
C) $3 \mathrm {~km} ^ { 2 }$
D) $\frac { 3 k } { m ^ { 2 } }$