Any notice or other communication required or permitted under this Agreement must be in writing and must be delivered personally, sent by certified, registered or express mail, sent by overnight courier (at the sender’s expense), or (if from the Corporation or the Corporation’s stock plan administrator) by electronic mail. Notice will be deemed given (a) when delivered personally, (b) if mailed, three days after the date of deposit in the U.S. mail, (c) if sent by overnight courier, on the regular business day following the date sent, or (d) when electronically mailed. Notice to the Corporation should be sent to CBOE Holdings, Inc., 400 South LaSalle Street, Chicago, Illinois 60605, Attention: General Counsel. Notice to Participant should be sent to the mailing address and/or electronic mailing address set forth on the Corporation’s records. Either party may change the address to which the other party must give notice under this Section 17 by giving the other party written notice of such change, in accordance with the procedures described above or otherwise established by the Corporation or its stock plan administrator.