John works for Mapple Corp., a computer business based in San Diego, California. John signed a non-disclosure agreement with Mapple where John agreed to not disclose Mapple's trade secrets without the prior consent of Mapple. Which, if any, of the following information could be subject to the non-disclosure agreement? a) Mapple's prospective customer lists Ob) Mapple's financial statements that have already been published to the public Oc) Mapple's existing marketing brochures d) All of these O e) None of these