A bank robber is holding staff and patrons hostage. An Operations Section has been activated with a Perimeter Control Group, Investigation Group, and SWAT Unit. The Command Staff includes the Incident Commander and a Public Information Officer, and the incident may extend into multiple operational periods. What are the different groups involved in the Operations Section?

1) Perimeter Control Group, Investigation Group, and SWAT Unit
2) Incident Commander and Public Information Officer
3) Bank robber and hostages
4) Operations Section and Command Staff