Splish Brothers Inc. purchased office supplies costing $ 8400 and debited Supplies for the full amount. At the end of the accounting period, a physical count of office supplies revealed $ 3000 still on hand. The appropriate adjusting journal entry to be made at the end of the period would be: O debit Supplies Expense, $ 3000; credit Supplies, $3000. O debit Supplies, $ 3000; credit Supplies Expense, $3000. O debit Supplies, $ 5400; credit Supplies Expense, $ 5400. O debit Supplies Expense, $ 5400; credit Supplies, $ 5400