The correct options are Enable the Kanban backlog for the shared board and Drag issues from one project into epics created in the other project.

Enable the Kanban backlog for the shared board is available because the Kanban backlog is a board level feature that you can turn on for any Kanban board. When a board is based on a filter that spans multiple projects the backlog panel and its controls belong to the board and therefore can be enabled for that shared view.

Drag issues from one project into epics created in the other project works because epics are just an issue type and the epic link can associate issues across projects when those issues are visible to the board. If the board filter includes both projects you can associate or drag issues into epics that originate in a different project.

Show versions from both projects on the Releases page is incorrect because the Releases page and versions are project scoped. Versions belong to individual projects so the Releases view will not automatically merge versions from separate projects into a single project scoped Releases list.

Advanced Roadmaps is incorrect because Advanced Roadmaps is a separate planning tool and not a board capability. It provides cross project planning when set up, but it is not something that is simply enabled on a shared board as a board feature.

Drag issues from one project onto versions that belong to the other project is incorrect because versions are tied to a specific project. You cannot assign an issue to a version that belongs to another project simply by dragging on the shared board unless that version is available in the issue's project context.

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