What is the relationship between 'comScore' and 'Rentrak' in the context of the input sentence.
Options: chief executive officer, subsidiary, owner of, stock exchange

Information regarding the persons who may, under the rules of the SEC, be deemed participants in the solicitation of comScore or Rentrak security holders in connection with the proposed merger will be set forth in the registration statement and the joint proxy statement/prospectus when filed with the SEC.
owner of