Browne and Red, both C corporations, formed the BR Partnership on January 1, 2014. Neither Browne nor Red is a personal service corporation, and BR is not a tax shelter. BR’s gross receipts were $4.6 million, $5 million, $6 million, and $7 million, respectively, for the four tax years ending in 2014, 2015, 2016, and 2017. Describe the methods of accounting available to BR in each tax year.