Which of the following statements is correct? (i) 3 is a factor of 32. (ii) 20 and 32 have 3 common factors. (iii) 63 has only 2 factors other than1 and itself (iv) 7 is a factors of 46.

• A.   (i) only
• B.  (ii) only
• C.  (i) and (iii) only
• D.  (i) and (iv) only