www.sec.gov/edgar

Visit www.sec.gov/edgar and search for the Dropbox annual report (10-K) for the year ended December 31,2018 , using EDGAR (Electronic Data Gathering, Analysis, and Retrieval system). Locate the note titled "Description of the Business and Summary of Significant Accounting Policies." Required: Dropbox refers to its uncollectible accounts as doubtful accounts. What factors does Dropbox consider when it establishes an allowance for doubtful accounts (also commonly referred to as allowance for uncollectible accounts) for trade and other receivables? Note: You may select more than one answer. Single click the box with the question mark to produce a check mark for a correct answer and double click the box with the question mark to empty the box for a wrong answer. Any boxes left with a question mark will be automatically graded as incorrect. ? Age of each outstanding invoice. ? Anticipated future sales to each customer. ? Collection history of each customer. ? Production costs of the items sold