The 2017 Form 10-K of Oracle Corporation, for the May 31, 2017 year-end, included the following information relating to their allowance for doubtful accounts: Balance in allowance at the beginning of the year $327 million, accounts written off during the year of $137 million, balance in allowance at the end of the year $319 million. What did Oracle Corporation report as bad debt expense for the year? A) $27 million B) $129 million C) $118 million D) $151 million E) None of the above