Write $- 6 \sqrt { - 48 }$ In Terms of I and Simplify

Write $- 6 \sqrt { - 48 }$ in terms of i and simplify.

A) $- 24 i \sqrt { 3 }$
B) $24 i \sqrt { 3 i }$
C) $- 24 \sqrt { 3 }$
D) $- 6 i \sqrt { 3 }$
E) $24 i \sqrt { 3 }$