The backface-visibility CSS property determines whether the back face of an element is visible when it is turned away from the viewer (e.g., through a 3D rotation). By default, the back face is visible (visible), showing a mirrored version of the front face. Setting this property to hidden will make the element invisible when its back side is facing the user, which is useful for creating card-flipping animations and other 3D effects.

A. perspective-origin sets the position of the vanishing point for a 3D-positioned element, not its back-face visibility.

B. transform-origin sets the point around which a transformation (like rotation) is applied to an element.

C. transform-style defines how nested elements are rendered in 3D space, typically on the parent of the transformed elements.

- Mozilla Developer Network (MDN). (n.d.). backface-visibility. MDN Web Docs. Retrieved from https://developer.mozilla.org/en-US/docs/Web/CSS/backface-visibility. (See the initial summary paragraph).

- W3C. (2019, February 14). CSS Transforms Module Level 1. W3C Recommendation. Retrieved from https://www.w3.org/TR/css-transforms-1/#propdef-backface-visibility. (See Section 13, "The 'backface-visibility' Property").

- Google Developers. (n.d.). CSS 3D Transforms. Web Fundamentals. Retrieved from https://developers.google.com/web/fundamentals/native-hardware/css-tricks#css3dtransforms. (See the section discussing backface-visibility).