$79.$ For over a year, Christopher had NO permanent address and lived out of his car, taking a series of jobs in South Dakota, Arizona, and California in between his travels. He kept careful records of his work$-$related mileage and travel expenditures to deduct these as job$-$related travel expenses on his tax return. However, he likely would be unable to deduct these expenses since, during this year, he would be considered to have been a$($n$)$:A$.$nonresident worker.B$.$non$-$geographic designated worker.C$.$worker at large.D$.$itinerant worker