Simplify the Expression $$( u - 1 ) ( u - 4 ) ( u + 5 )$$

Multiple Choice

Simplify the expression. $$( u - 1 ) ( u - 4 ) ( u + 5 )$$

A) $u ^ { 3 } - 21 u + 20$
B) $u ^ { 3 } + 1 u + 20$
C) $u ^ { 3 } - 1 u ^ { 2 } - 21 u + 20$
D) $u ^ { 3 } - 10 u ^ { 2 } - 21 u + 20$