Article 1 - For the purposes of this Directive :

(a) "vehicle' means a vehicle as defined in Article 1 (1) of Directive 72/166/EEC;

(b) "bureau' means a national insurers' bureau as defined in Article 1 (3) of Directive 72/166/EEC;

(c) "guarantee fund' means the body referred to in Article 1 (4) of Directive 84/5/EEC;

(d) "parent undertaking' means a parent undertaking as defined in Articles 1 and 2 of Directive 83/349 / EEC (1);

(e) "subsidiary' means a subsidiary undertaking as defined in Articles 1 and 2 of Directive 83/349/EEC; any subsidiary undertaking of a subsidiary undertaking shall also be regarded as a subsidiary of the parent undertaking which is at the head of those undertakings.