The 2013 annual report of Oracle Corporation included the following information relating to their allowance for doubtful accounts: Balance in allowance at the beginning of the year $323 million, accounts written off during the year of $145 million, balance in allowance at the end of the year $296 million. What did Oracle Corporation report as bad debt expense for the year?
a. $27 million
b. $178 million
c. $118 million
d. $151 million
e. None of the above