1. On August 12th, 2021, the Chubb Corporation's Board of Directors declared a regular quarterly cash dividend of 80 cents per share to be paid Friday, October 8th, 2021, to shareholders of record as of the close of business on Friday, September 17 th. The New York Stock Exchange on which the shares were listed set the ex-dividend date to be Thursday, September 16 th. What was the last day an investor could purchase the shares of Chubb on the New York exchange and still receive this dividend