(a). This Agreement may be executed in counterparts (and by different parties hereto in different counterparts), each of which shall constitute an original, but all of which when taken together shall constitute a single contract (subject to Section 11.2 ) and shall become effective as provided in Section 11.2. Delivery of an executed counterpart of a signature page of this Agreement by facsimile or in electronic ( e.g. , “pdf” or “tif”) format shall be effective as delivery of a manually executed counterpart of this Agreement.