The correct approach is to create the new role at the organization level to ensure it applies to all current and future projects. This method aligns with Google's recommended practices. Option A is correct because it directly addresses the requirement by combining the roles at the organization level. Option B is incorrect because gcloud iam promote-role cannot elevate a role to the organization level. Option C is incorrect as it does not result in a new role. Option D is not recommended because it unnecessarily complicates the process and does not automatically apply the role to new projects.