Match the polynomial function to its correct roots

Place the letter of the list of correct roots next to each function listed below:

 1. $f(x)=16 x^4-8 x^2+1$
 2. $f(x)=16 x^4-16 x^3+4 x-1$
 3. $f(x)=16 x^4+32 x^3+24 x^2+8 x+1$
 4. $f(x)=4 x^4+4 x^3+5 x^2+4 x+1$

A. $x= 0.5,$ with multiplicity 2, $x = -0.5,$ with multiplicity 2
B. $x = -0.5,$ with multiplicity 4
C. $x= 0.5,$ with multiplicity 3, $x = -0.5$
D. $x=-0.5,$ with multiplicity 2, $x=i, x=-i$