Establishment of the Punjab Enforcement and Regulatory Authority is mentioned in:

Section 3 is the correct answer. Following the initial sections that define the Act's scope and terms (Sections 1 and 2), the establishment of a new body or authority is typically addressed in an early substantive section. Section 3 logically introduces the creation of the Punjab Enforcement and Regulatory Authority.

• Section 2 is reserved for definitions.
• Section 4 would typically detail the composition or powers of the established authority, not its initial establishment.
• Section 6 would cover even further operational aspects.