For each of the following costs, identify whether it is a Fixed, Variable or Both:

\begin{tabular}{|l|l|} \hline \multicolumn{1}{|c|}{ Cost } & \multicolumn{1}{c|}{ Type } \\ \hline Wages of assembly-line workers & \\ \hline Depreciationoffice equipment & \\ \hline Glue and fasteners & \\ \hline Delivery costs & \\ \hline Raw materials handling costs & \\ \hline Salary of marketing manager & \\ \hline Production run setup costs & \\ \hline Plant utilities & \\ \hline Electricity cost of manufacturing plant & \\ \hline Research and development expenses & \\ \hline \end{tabular}