Write in Exponential Form $- 4 \sqrt { 6 m ^ { 9 } }$

Multiple Choice

Write in exponential form. Assume all variables are positive real numbers.
- $- 4 \sqrt { 6 m ^ { 9 } }$

A) $- 4 \cdot 6 ^ { 1 / 2 } \mathrm {~m} ^ { 9 / 2 }$
B) $96 \mathrm {~m} ^ { 2 / 9 }$
C) $- 96 m ^ { 9 / 2 }$
D) $( - 4 \cdot 6 ) ^ { 1 / 2 } m ^ { 9 / 2 }$