Which of the following accounts are closed at the end of the accounting period? Allowance for Doubtful Accounts Accumulated Depreciation Depreciation Expense Doubtful Accounts Expense Gain (Loss) on Sale of Equipment None of these are closed. Only Allowance for Doubtful Accounts and Accumulated Depreciation. All of these are closed. All of these are closed except for Allowance for Doubtful Accounts and Accumulated Depreciation. Only Doubtful Accounts Expense and Gain on Sale of Equipment