The first Amendment to the Constitution (1951) made changes in relation to which of the following provisions? 1. Special provisions for advancement of socially and educationally backward classes. 2. Validation of certain Acts and Regulations specified in the Ninth Schedule. 3. Saving of certain laws giving effect to certain Directive Principles 4. Saving of laws providing for acquisition of estates Select the correct answer using the codes given below:

• A.  1, 2 and 3         
• B.  1, 2 and 4
• C.  2, 3 and 4         
• D.  1, 3 and 4