One multiple choice question

Gore Inc. recorded a loss and a liability in 2016 for probable litigation losses of $2 million. Ultimately, $5 million in legitimate warranty claims were filed by Gore's customers in 2017. Select one: a. Gore is required to adjust a change in accounting estimate retropectively. b. Gore is not required to make any accounting adjustments to the beginning retained earnings of 2017. c. Gore needs to correct an accounting error. d. Gore has made a change in accounting principle, requiring retrospective adjustment