Was ist keine staatliche Gewalt in Deutschland?

Why this is the correct answer

German state authority is divided into three branches: the legislature (Bundestag and Bundesrat), the executive (federal government and civil service), and the judiciary (courts). Directives, as in internal administrative instructions, are not a constitutional branch of government — they are tools used within the executive branch. Only the three-branch structure defined in Article 20 constitutes state power.