Classify each of the following costs as Product $($direct$/$indirect$)$ or Period and Variable, Fixed or Mixed.

$\backslash$table$[[$Costs$,\backslash$table$[[$Product $($Direct$/$lndirect$)],[$or Period$]],$Variable$/$Fixed$/$Mi$],[$Wages of assembly$-$line workers,,$],[$Depreciation of plant equipment,,$],[$Glue and nails for production,,$],[$Outbound delivery expense,,$],[$Raw materials handling costs,,$],[$Salary of marketing manager,,$],[$Production run setup costs,,$],[$Administrative office utilities,,$],[$Electricity cost of retail stores,,$],[$Research and development expense,,$]]$