$\backslash$table$[[1,$Trial Balance,Credit$],[$December $31],[3,,$Debit$],[4,$Cash,$$5,700,],[5,$Accounts receivable,$1,400,],[6,$Notes receivable,$11,100,],[7,$Prepaid services,$3,800,],[8,$Office equipment,$27,400,],[9,$Accounts payable,,$$7,600],[10,$Unearned ticket revenue,,$4,400],[11,$Common stock,,$37,000],[12,$Dividends,$1,600,],[13,$Ticket revenue,,$7,200],[14,$Rental revenue,,$1,700],[15,$Salaries expense,$2,800,],[16,$Utilities expense,$2,400,],[17,$Rent expense,$1,700,],[18,$Totals,$$57,900,$$$57,900]]$

Which formula correctly calculates total liabilities?

$C10+C9$

$=+C9+C10$

$=C9$

$C9+C10$