Classify each of the following costs as variable or fixed with respect ice cream sales.

$\backslash$table$[[$Cost Description$],[1.$ Batch freezer depreciation$],[2.$ Water costs$],[3.$ Cost of ice cream ingredients$],[4.$ Monthly store rent$],[5.$ Cost of stainless$-$steel cups used for in$-$store sales$],[6.$ Wages paid to employees serving in$-$store customers$],[7.$ Cost of disposable cups, lids, and spoons used for mobile sales$]]$