Which of the following costs could be directly saced to specific mobile sales events, such as selling pre$-$packaged servings of ice cream at the Cold Mountain Music Festival?

$\backslash$table$[[1.$ Wages paid to employees serving ice cream at the event,Yes$],[2.$ Cargo trailer depreciation,Yes$],[3.$ Cost of ingredients used to make ice cream sold at the event,No$],[4.$ Registration fee paid to the event organizer,Yes$],[5.$ Gasoline cost incurred to transport ice cream to the event,Yes$],[6.$ Insurance cost for truck used to tow cargo trailer,Yes$],[7.$ Cost of disposable cups and lids used to pre$-$package ice cream,Yes$]]$