已知 $\boldsymbol{F}(x, y, z)=\left(x^2+y^2\right)^2+z^4-y$
(1) 若 $x^2+y^2+z^2=\frac{1}{4},(x, y, z \neq 0)$ ,证明:
$$
\frac{\boldsymbol{F}_x^{\prime}}{2 x}+\frac{F_y^{\prime}+1}{2 y}+\frac{\boldsymbol{F}_z^{\prime}}{z}=1 .
$$
(2) 求 $\boldsymbol{F}(x, y, z)=0$ 所围成立体区域的体积.
$\text{A.}$
$\text{B.}$
$\text{C.}$
$\text{D.}$