If x,y,zx, y, zx,y,z are in AP, which of the following is true?
y2=xzy^2 = xzy2=xz
2y=x+z2y = x + z2y=x+z
y=x+zy = x + zy=x+z
z−y=y−xz - y = y - xz−y=y−x