Consider the following statements about the Dispute Settlement Mechanism (DSM) of the WTO:

I. The DSM is the central pillar of the WTO system, providing a structured process for resolving trade disputes between members.

II. The process involves consultation, panel formation, appellate review, and implementation.

III. The Appellate Body has been non-functional since 2019 due to the US blocking appointments of new members.

IV. All WTO dispute settlement rulings are automatically enforced without any further action by members.

Which of the statements given above are correct?