What Recommendation Does the Model Code Make in Cases of Market

What recommendation does the Model Code make in cases of market disruption?

A) Market participants should strictly adhere to the rules issued by local regulators, supervisors or central banks in order to maintain efficiency and avoid disputes.
B) Even if local provisions are in place, market participants should only adhere to the ACI best practices of the Model Code in order to maintain efficiency and avoid disputes.
C) Participants must at all times adhere to the rules issued by local regulators, supervisors or central banks even if these rules or procedures conflict with any provision of an existing written agreement.
D) Parties may unilaterally decide whether they wish to adhere to the terms of the agreement or to amend the terms of the transaction to follow the relevant procedure.