Explanation:

A rule on procedure laid down by law also come within the purview of Act as any rule of substantive law. 

A procedural law is equally subject to these constitutional limitations as a substantive law. In State of West Bengal v. Anwar All Sarkar , Mukherjea, J., observed:

• A rule of procedure laid down by law comes as much within the purview of Article 14 as any rule of substantive law and it Is necessary that all litigants, who are similarly situated, are able to avail themselves of the same procedural rights for relief and for defence with like protection and without discrimination." No general rule applicable to all cases can be safely laid. down to ascertain whether an enactment which provides for a special procedure for trial of certain offences is or is not discriminatory and, therefore, violative of Article 14.

Hence option 1st is correct.