Explanation:

- Explicit Cost:

- Refers to direct payment made to others for purchasing factors of production.

- These are out-of-pocket costs like wages, rent, and materials.

- Associated with cash outflow and are easily identifiable in accounting.

- This is the correct answer.

- Money Cost:

- Synonymous with explicit cost, emphasizing monetary expenses.

- Focuses on the financial expenditure for production factors.

- Real Cost:

- Involves the opportunity and social costs of using resources.

- Considers the true economic value of resources used.

- Implicit Cost:

- Represents the opportunity cost of using resources owned by the firm.

- Includes forgone income from employing resources elsewhere.