The adjusted trial balance as at 30 June 2020 below has a missing account balance. Debit $ Credit $ Cash at Bank 72,000 Accounts Receivable 12,500 Office Equipment 15,000 Accounts Payable 5,000 Capital 80,000 Service Revenue 32,500 Depreciation Expenses 3,000 Salary Expense 18,000 120,500117,500 The missing account and its balance could be: O a. Bank Loan: Debit Balance $3,000 b. Unearned Revenue: Debit Balance $3,000 C. Accumulated Depreciation - Office Equipment: Credit Balance $3,000 d. Supplies: Credit Balance $3,000