The correct option is Workflow status property.

Workflow status property controls behaviors and restrictions that apply to an issue based on its current status. Administrators can set properties on a status that prevent edits or restrict specific operations when the issue enters that status. If Marcus can no longer change ticket details after moving the ticket to Signoff then a status property on Signoff is the most likely cause.

Field configuration is incorrect because field configurations control whether fields are required, hidden, or have specific behaviors, and they do not generally lock editing of the entire issue when the status changes.

Transition screen is incorrect because transition screens determine which fields are shown or required during a specific transition, and they do not prevent further edits after the transition completes.

Issue security level is incorrect because issue security levels limit who can view an issue, and they do not by themselves stop a user who can view the issue from editing it.

Project permission scheme is incorrect because project permissions manage who can perform actions across the project, and if Marcus could edit before the status change then a project permission change is not the cause of edit restrictions tied to a specific status.

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