With reference to the Directive Principles of State Policy (DPSP), which of the following statements is/are correct?

1. They help the courts in examining and determining the constitutional validity of a law.

2. They are not legally enforceable by the courts for their violation.

3. They are classified into three broad categories, viz, socialistic, Gandhian, and liberal–intellectual by the constitution.

Select the correct answer using the code given below.