The doctrine of forum non conveniens may be employed when?

When the venue is improper.
When the case should have been heard in federal court.
When the forum is inconvenient, inappropriate or unacceptable.
When the court lacks subject matter jurisdiction.

When the doctrine of forum non conveniens is raised during a lawsuit:

It must be automatically applied upon proof that an adequate alternative forum exists.
It may be applied at the judge’s discretion.
It can only be applied by the jury.
It can only be applied if the plaintiff agrees.

Felicia and Marsha are involved in an automobile collision in Manhattan in New York City. Both are residents of Manhattan. Felicia files an action against Marsha in state Supreme Court in Westchester County, New York. Marsha seeks to invoke the doctrine of forum non conveniens. Is the court likely to apply the doctrine?

Yes, because there Marsha is the defendant, and she should have the choice of forum.
No, because Felicia is the plaintiff, and she should have the choice of forum.
No, because the case should be heard in federal court.
Yes, because public interest factors are implicated.