Sketch the Graph Of $P$ To Find All Real Zeros $P ( x ) = x ^ { 4 } - 5 x ^ { 2 } + 4$

Multiple Choice

Sketch the graph of $P$ to find all real zeros. $P ( x ) = x ^ { 4 } - 5 x ^ { 2 } + 4$

A) zeros: $- 2 , - 1,1,2$
B) zeros: $- 4 , - 1$
C) zeros: $1,2$
D) zeros: $- 2 , - 1,1,0$
E) zeros: $- 1,0,2$