If a dysfunctional norm is very deeply ingrained in a team and solutions have not worked, the best strategy is probably to

Multiple Choice

provide direct reinforcement and punishment to the employees.

supplement the existing group with one or two people who have more appropriate norms.

tell the group that corporate leaders are willing to tolerate the dysfunctional norm.

disband the group and replace it with people who have more appropriate norms.

introduce rewards that support the dysfunctional norm.