Answer:
a. classifies expenses by function.
Explanation:
Multiple step format of income statement has the distinction of classifying expenses based on function as direct cost (non operational cost) and indirect cost ( operational cost).
Direct cost is cost that can be directly traced to the product like cost of raw materials.
Indirect cost is not directly linked to the product and includes salaries, rent, marketing cost, research and development, accounting fees, and legal fees.
Single step format on the other hand does not divide expenses based on function, but states the simplified revenue and expense of a business.