Which of the following statements is/are correct? (1) The diagonals of a rectangle are perpendicular. (2) The diagonals of a rhombus are equal. (3) Every square is a rhombus. (4) None of these

• A.  only 1             
• B.            only 3
• C.  1 and 2         
• D.           all 1, 2, and 3