The primary principles of UI design of a desktop system include principles which also generally apply to other types of devices. Which of the following principles is NOT an important guideline when considering the layout and format of a particular screen.
a. Each screen should have a primary purpose

A ________ can be used to gather network information or user data

A) RFMON B) packet sniffer C) whaling device D) None of the above

Teeter Company began 2017 with accounts receivable of $400,000 and an allowance for uncollectible accounts of $20,000 (credit balance). Bad debt expense for the year was $33,000 and the ending balance in the allowance for uncollectible accounts account was $15,000. What was the amount of accounts receivable written off during the year?

A) $5,000 B) $38,000 C) $438,000 D) $405,000