Which styles of handling conflict is most appropriate whenever there is enough time, trust can be established, the issue is important to both sides and buy-in is needed?

the answer is confrontation

Explanation:

Confrontation is a style of conflict resolution whereby all the conflicting groups brings all the issues in the open in an attempt to resolve the conflict.

Its is most effective when the groups need to cooperate to get the jib done effectively and there is a maximum level of trust among the group.

answermultidomestic strategy;