(A) If the positive z-axis points upward, an equation for a horizontal plane through the point $\left(-3,1,-3\right)$ is
.

(B) An equation for the plane perpendicular to the x-axis and passing through the point $\left(-3,1,-3\right)$ is
.

(C) An equation for the plane parallel to the xz-plane and passing through the point $\left(-3,1,-3\right)$ is
.