What form must the Incident Commander fill out and have the owner occupant sign during lock in-outs?

The correct answer is the Release Form IDC-3. This form is specifically designed for situations involving lock in-outs, where access to a property is necessary due to emergencies, such as a fire or medical situation. The purpose of the form is to document the incident and ensure that the owner or occupant acknowledges and consents to the actions taken by the Incident Commander and the emergency services. Having the owner's signature provides legal protection for the responders and verifies that all parties understand the circumstances surrounding the lock-in or lock-out event.

The other options do not serve this specific purpose. The Emergency Response Form is more general and may not apply to individual incidents like lock in-outs. The Lock Out Form might imply a different kind of procedure, possibly referencing equipment lockout/tagout processes rather than property access in emergencies. The Incident Report Form is typically used to summarize an entire incident but does not specifically require the owner or occupant's signature as part of the lock-in/out procedure.