Simplify the Expression $$\left( 2 a ^ { 6 } b ^ { 8 } \right) \left( - 4 a ^ { 7 } b ^ { 4 } \right)$$

Multiple Choice

Simplify the expression. Assume all variables represent nonzero real numbers.
- $$\left( 2 a ^ { 6 } b ^ { 8 } \right) \left( - 4 a ^ { 7 } b ^ { 4 } \right)$$

A) $8 \ a ^{13}b^{13}$
B) $- 8 a ^ { 42 } b ^ { 8 }$
C) $8 a ^ { 41 } b ^ { 8 }$
D) $- 8 \mathrm { a } ^ { 13 } \mathrm {~b} ^ { 12 }$