53In addition, it points out that the discretion which it has must be exercised in compliance with the criteria of gravity and duration of the infringement laid down by that article, with the general principles of Community law, in particular the principles of proportionality and equal treatment, and with the case-law of the Court of Justice and the Court of First Instance. The Commission thus maintains that it must comply with those principles whenever it makes use of its discretion (see, with regard to compliance with the principle of equal treatment, Case T-15/99Brugg Rohrsysteme v Commission [2002] ECR II-1613, paragraph 149 et seq., and Case T-224/00Archer Daniels Midland and Archer Daniels Midland Ingredients v Commission [2003] ECR II-2597, paragraphs 69, 207, 281 and 308, and the Opinion of Advocate General Ruiz Jarabo Colomer in Joined Cases C-204/00 P, C-205/00 P, C-211/00 P, C-213/00 P, C-217/00 P and C-219/00 PAalborg Portland and Others v Commission [2004] ECR I-123, at I-133, point 96 et seq.).