An Operations-level responder finds a small leak (~5 gpm) from the dome lid of a railroad tank car carrying flammable liquid. The CORRECT action is:

1. Climb the tank car and tighten the dome bolts
2. Use a non-sparking tool to apply a wooden plug
3. Isolate the area, attempt vapor suppression with foam if trained, and request Technician resources
4. Open the bottom outlet to relieve pressure