Which of the following was the result at the u. s. supreme court level in metro-goldwyn-mayer studios inc., v. grokster, ltd., the case in the text in which the court addressed the legality of the defendants allowing digital music files to be shared directly between users without going through a centralized server? (a) the district court properly dismissed the suit because the system at issue had both legal and illegal uses. (b) the defendants had no responsibility to develop filtering tools or other mechanisms to diminish infringing activity and the district court properly dismissed the lawsuit. (c) the district court improperly dismissed the suit because a distributor who promotes infringement and takes steps to foster infringement is liable for infringement by third parties. (d) there was no evidence that the defendants profited from the site allowing file sharing and, therefore the district court properly dismissed the lawsuit (e) the defendant's peer-to-peer file sharing service was struck down by the supreme court