Correct Answer:
C. At once
The correct answer is At once. This legal phrase signifies that the Punjab Enforcement and Regulatory Authority (Operations and Procedures) Rules 2025 became effective immediately upon their official notification or publication, without any waiting period. This ensures prompt implementation of the regulatory framework.
- After a 30-day notification period is incorrect as it implies a delay, contradicting the immediate effect.
- On a date to be notified later is incorrect because it suggests an unspecified future commencement, not an immediate one.
- After approval by the Board is incorrect because while Board approval might be an internal prerequisite, the legal 'coming into force' for the public is typically tied to official gazette notification, and 'at once' specifies this immediate public effect.