Arrange the following steps in a correct sequence as per Gram's staining technique. (i) Treatment with 0.5% iodine solution. (ii) Washing with water. (iii) Treatment with absolute alcohol/acetone. (iv) Staining with weak alkaline solution of crystal violet. The correct sequence is:

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