Choose each answer that is a minimal sum expression for the function f(w,x,y,z)=m(0,2,4,5,7,8,10,12,13,15). Don't select any answer that is not a minimal sum expression for this function.
A. f(w,x,y,z)=xz+x'z'+xz'
B. f(w,x,y,z)=xz +x'z'+y'z'
C. f(w,x,y,z)=xz +x'z'+xy'
D. f(w,x,y,z)=xz'+x'z'+w'z'
E. None of the other answers is correct.