What are the principles that a negotiator should keep in mind when setting a target point in a negotiation? $($Select all that apply.$)$

Multiple select question.

When setting targets, one should consider how to package many issues and objectives.

Targets should be verifiable, specific, and attainable.

Negotiators should focus attention on the other party to the exclusion of themselves.

A negotiator should define quantifiable goals ambiguously.

When setting targets, one should have an understanding of trade$-$offs and throwaways.

A negotiator should be proactive in thinking about his or her own objectives.

Negotiators should threaten the other party and put them on the defensive.