Unquestionably, inventors of useful devices deserve credit for their ingenuity, but the engineers who help develop an invention get too little recognition. Although inventors sometimes serve as their own engineers, more often, engineers must translate an inventor' s insight into something workable and useful. Ttherefore, engineers also deserve credit for their contribution. The claim that inventors sometimes serve as their own engineers plays which one of the following roles in the argument? ['It supports an earlier statement regarding what is at issue in the argument.', 'It introduces an alternative solution to the problem the argument is addressing.', 'It indicates that the problem identified in the argument does not arise in every instance.', 'It concedes that a distinction on which the argument relies is unclear.']