Blunt abdominal trauma presentation workup

In a patient with blunt abdominal trauma who is hemodynamically unstable, what does a positive focused assessment with sonography for trauma (FAST) exam indicate as the next step?

1: Proceed with an immediate computed tomography (CT) scan.
2: Monitor with serial FAST examinations.
3: Perform diagnostic peritoneal lavage.
4: Undertake an emergency laparotomy.