Facebook, Incorporated, which also owns Instagram, Messenger, WhatsApp, and Oculus (virtual reality products), generates "substantially all of our revenue from selling advertising placements to marketers." Following is a trial balance listing accounts that Facebook uses. Assume that the balances are unadjusted at the end of a recent fiscal year ended December 31. Required: 2. Which accounts should be closed at the end of the year? 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. Revenue Interest and other income ? Research and development expense ? General and administrative expense