154It should also be noted, as the Commission submits, that it has discretion as to whether it is appropriate to adopt investigative measures. Thus, contrary to what is argued by the applicants, an expression of the Commission’s bias in respect of the applicants cannot be inferred in an abstract manner from the existence of such a discretion as to how to conduct the investigation. On the contrary, the failure to adopt other investigative measures can be explained above all by the Commission’s exercise of its discretion as regards the appropriateness of adopting such measures. It was therefore for the applicants to put forward arguments specifically to demonstrate that the absence of additional investigative measures could be explained only by the Commission’s bias and not by the Commission’s legitimate exercise of its discretion in conducting the investigation.