This Agreement may be executed in several counterparts, each of which when executed and delivered is an original, but all of which together shall constitute one instrument. In making proof of this Agreement, it shall not be necessary to produce or account for more than one such counterpart that is executed by the party against whom enforcement of this Agreement is sought. Handwritten signatures to this Agreement transmitted by telecopy or electronic transmission (for example, through use of a Portable Document Format or “PDF” file) shall be valid and effective to bind the party so signing.