Final answer:
Direct labor refers to the wages and salaries paid to workers who are directly involved in the production of goods or services. Supervisors' wages are not classified as direct labor. Bakers in a bakery and bottles of beer in a brewery are examples of direct labor.
Step-by-step explanation:
Direct labor refers to the wages and salaries paid to workers who are directly involved in the production of goods or services. It does not include the wages of supervisors or the cost of materials used to make the product. Therefore, wages of supervisors is not classified as direct labor.
On the other hand, bakers in a bakery and bottles of beer in a brewery are examples of direct labor as they directly contribute to the production process.