A data analyst has been asked to create a sales report that calculates the rolling 12-month average for sales. If the report will be published on November 1, 2020, which of the following months shouts the report cover?

A. October 1, 2019 to October 31, 2020
B. October 31, 2020 to November 1, 2021
C. November 1, 2019 to October 31, 2020
D. October 31, 2019 to October 31, 2020