Identify each cost as being classified as a selling, general &administrative $($SG&A$)$ or a product cost:

Group of answer choices

Salary of the vice president of manufacturing.

Commissions paid to sales staff.

Salaries of administrative secretaries$.$

Salary of the vice president of marketing.

Salary of middle managers in manufacturing plant.

Salary of the company president.

Wages of production workers.

Salaries of engineers and maintenance crew.

Salary of the chief financial officer.