On September 11th, the SEC provided notice of the Chicago Board Options Exchange's and C2 Options Exchange's individually filed proposals to modify their respective complex order auction ("COA") procedures to provide that a request for response ("RFR") message will identify the side of the market of an order that is subject to COA and to clarify that RFR responses must be on the opposite side of the market from the COA order. Comments should be submitted on or before October 9, 2012.