The correct options are Saved filters and Workflow conditions.

A Saved filters entry can explicitly reference a group in its JQL or in its sharing settings and removing the group can break saved searches or change who can view or use the filter. For that reason saved filters are a prime place to look when you plan to remove a group.

Workflow conditions often include checks such as User Is In Group that reference a specific group to allow or block transitions. Removing the group can change workflow behavior or prevent transitions so workflow conditions must be checked.

Project roles can have groups assigned to them so they may be affected when a group is removed. They are not the first place to check for explicit group references because saved filters and workflow conditions tend to contain direct references that will immediately break functionality.

System default dashboard typically does not contain direct group references. Dashboards may include gadgets that rely on filters, so checking filters is more effective than checking the default dashboard first.

Issue type schemes define which issue types apply to projects and do not reference user groups, so removing a group will not affect issue type schemes.

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