Correct Answer:
D. Government of Punjab in the Gazette
The Act shall come into force on a date notified by the Government of Punjab in the Gazette. This is a common legal provision allowing the executive branch to determine the precise commencement date of an Act, often to allow for necessary administrative preparations. While the Chief Minister and Governor are key figures, the formal legal mechanism for such notification is through official publication in the provincial Gazette by the Government of Punjab. The Provincial Assembly passes the law but does not typically set its commencement date post-enactment.