1. Where basic acts adopted before the entry into force of this Regulation provide for the exercise of implementing powers by the Commission in accordance with Decision 1999/468/EC, the following rules shall apply:
(a) where the basic act makes reference to Article 3 of Decision 1999/468/EC, the advisory procedure referred to in Article 4 of this Regulation shall apply;
(b) where the basic act makes reference to Article 4 of Decision 1999/468/EC, the examination procedure referred to in Article 5 of this Regulation shall apply, with the exception of the second and third subparagraphs of Article 5(4);
(c) where the basic act makes reference to Article 5 of Decision 1999/468/EC, the examination procedure referred to in Article 5 of this Regulation shall apply and the basic act shall be deemed to provide that, in the absence of an opinion, the Commission may not adopt the draft implementing act, as envisaged in point (b) of the second subparagraph of Article 5(4);
(d) where the basic act
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