Question Stem: 如图, 四边形ABCD中AD = CD, AB = CB, 连接AC, BD交于点O, 得到了如下结论, 其中错误的是() Options: A. AC ⊥ BD B. AO = CO C. △ABD ≌ △CBD D. AO + DO = BO---**Extraction Content:** **Chart/Diagram Description:** * **Type:** Geometric figure. * **Main Elements:** * **Points:** Points A, B, C, D are vertices of a quadrilateral. Point O is the intersection point of the diagonals. * **Lines:** Straight line segments connect the points to form the sides of the quadrilateral (AB, BC, CD, DA) and the diagonals (AC, BD). * **Relative Position and Direction:** The points A, B, C, D are arranged to form a quadrilateral. The diagonals AC and BD intersect at point O. Point O is located inside the quadrilateral. * **Labels and Annotations:** The vertices are labeled A, B, C, D. The intersection of the diagonals is labeled O. **Other Relevant Text:** * None present in the image. **Question Stem:** * None present in the image. **Options:** * None present in the image.