Custom field context is correct because it allows different sets of choices for the same custom field to be scoped to specific projects and issue types.

Custom field contexts let an administrator define separate option lists and apply them to particular projects or issue types. Laura can create a context that is limited to her company-managed project so that the shared "Team Seniority" field has a unique set of choices there while other projects keep the original options.

Issue layout is wrong because it controls how fields are displayed on the issue view and it does not change the selectable options for a custom field.

Permission scheme is wrong because it governs user rights like who can create edit or transition issues and it has no effect on the option sets of a custom field.

Screen scheme is wrong because it assigns which screens appear on create edit and view operations and it does not provide per-project option lists for a custom field.

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