Under Our Legal System, Jurisdiction Over the Defendant's Person Rests

Under our legal system, jurisdiction over the defendant's person rests on three factors: (1) the person's domicile or residence in the place where sued, (2) proper service of process on the person in the place where sued, and (3) the person's consent to the suit.Which of the following would be considered a situation in which a person could give consent to the suit?

A) Defendant makes a general appearance.
B) The cause of action arises out of doing business in the area of the court's jurisdiction.
C) Both A and B are true.
D) None of the above is true.