Which of the following statements are true about Fluids statics (Assume non-viscous fluid)?
(A) If a container filled with water is accelerated with constant acceleration $10\sqrt{3}{\text{ m/s}}^{\text{2}}$ then the free surface makes angle $30°$ with the horizontal.

(B) If a container filled with water is rotated with constant angular velocity about a vertical axis passing through its center, then the free surface will form an elliptical shape.

(C) If a body is fully or partially submerged in a liquid, then it experiences an upward thrust force equal to the weight of displaced liquid.

(D) Force exerted by a fluid at rest on submerged bodies is perpendicular to the surface of the body at all points.