Which of the following pairs are resonance structures of each other? 
Definitions:
Accounts Payable
The amount of money a company owes creditors (suppliers, etc.) in return for goods and services they have delivered.
Operating Expenses
The ongoing costs incurred in the day-to-day operations of a business, excluding costs associated with the production of goods or services.
Gross Collection Ratio Formula
A financial metric used to assess the efficiency of a company's collections department, calculated by dividing total collections by the total amount of billable charges.
Total Charges
The complete amount of money required for a particular service, product, or procedure, including all associated costs and fees.
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