Which of the following can be classified as an Asset, Liability, Stockholders Equity, Revenue or Expense item?

Accounts Payable, Equipment, Sales Revenue, Service Revenue, Mortgage Payable, Supplies Expense, Rent Expense, Salaries and Wages Expense, Cash , Accounts Receivable,Inventory,Prepaid Insurance, Retained Earnings, Cost of goods sold, Notes Payable, Interest expense