Classify each of the costs below as either a product cost or a period cost under $($a$)$ absorption costing and $(b)$ variable costing.

$\backslash$table$[[\backslash$table$[[$Cost$],[$Direct materials$]],$Amount,Absorption Costing,Variable Costing$],[$$$,3$ F$,$per unit$],[$Direct labor,$$,5,$per unit,,$],[$Variable overhead,$$,2,$per unit,,$],[$Fixed overhead,$$,250,000,$per year,,$],[$Variable selling and administrative expenses,$$,0\mathrm{.}60,$per unit,$-,],[$Fixed selling and administrative expenses,$$,150,000,$per year,,$]]$