b. After the information has been received, or after the period established has elapsed and the information has not been received, the Commission shall ascertain whether the grounds for the petition or communication still exist. If they do not, the Commission shall order the record to be closed. c. The Commission may also declare the petition or communication inadmissible or out of order on the basis of information or evidence subsequently received. d. If the record has not been closed, the Commission shall, with the knowledge of the parties, examine the matter set forth in the petition or communication in order to verify the facts. If necessary and advisable, the Commission shall carry out an investigation, for the effective conduct of which it shall request, and the states concerned shall furnish to it, all necessary facilities. e. The Commission may request the states concerned to furnish any pertinent information and, if so requested, shall hear oral statements or receive written statements from the parties concerned.