Jimmy wrote the following proof to show that the diagonals of rectangle ABCD are congruent: Jimmy's proof: Statement 1: Rectangle ABCD is given Statement 2: segment AB ≅ segment DC because opposite sides of a rectangle are congruent Statement 3: Angles ABC and DCB are both right angles by definition of a rectangle Statement 4: Angles ABC and DCB are congruent because all right angles are congruent) Statement 5: Statement 6: Triangles ABC and DCB are congruent by SAS Statement 7: segment AC ≅ segment DB by CPCTC Which statement completes Jimmy's proof?