Requlred: Of the IRS-stipulated lookback periods, which one(s) islare the most commonly used? Note: You may select more than one onswer. Single cllek the box with the question mark to produce a check mark for a correct onswer and double cllek the box with the question mark to empty the box for a wrong answer. Any boxes left with a questlon mark will be automaticelly graded os incorrect. 2 Monthily ? Annualy 2 semineeky 2 Noxtbusnesf Day