Find All Real Zeros of the Polynomial $f ( x ) = x ^ { 4 } - 61 x ^ { 2 } + 900$

Multiple Choice

Find all real zeros of the polynomial $f ( x ) = x ^ { 4 } - 61 x ^ { 2 } + 900$ and determine the multiplicity of each.

A) $x = - 5 , \text { multiplicity } 2 ; x = - 6 , \text { multiplicity } 2$
B) $x = 25 , \text { multiplicity } 2 ; x = 36 \text {, multiplicity } 2$
C) $x = 5 , \text { multiplicity } 2 ; x = 6 , \text { multiplicity } 2$
D) $x = 25 , \text { multiplicity } 2 ; x = 6 , \text { multiplicity } 2$
E) $x = 5 \text {, multiplicity } 1 ; x = - 5 \text {, multiplicity } 1 ; x = 6 \text {, multiplicity } 1 ; x = - 6 \text {, multiplicity } 1$