Simplify the Expression as Completely as Possible $$- a a ^ { 4 } a ^ { 3 }$$

Multiple Choice

Simplify the expression as completely as possible. $$- a a ^ { 4 } a ^ { 3 }$$

A) $- a ^ { 12 }$
B) $a ^ { 12 }$
C) $- a ^ { 7 }$
D) $- a ^ { 8 }$
E) $a ^ { 8 }$