Completely Factor the Polynomial or State That the Polynomial Is $$x ^ { 3 } + 40 x ^ { 2 } + 400 x$$

Multiple Choice

Completely factor the polynomial or state that the polynomial is prime.
- $$x ^ { 3 } + 40 x ^ { 2 } + 400 x$$

A) $x ( x + 20 ) ( x - 20 )$
B) prime
C) $x ( x + 20 ) ^ { 2 }$
D) $x ( x - 20 ) ^ { 2 }$