A contra-revenue account is a provision for dubious accounts. The right response in this case is option A.
Because it lowers the value of an asset in this example, the accounts receivable the allowance for dubious accounts is referred to as a "contra asset." The allowance, also known as a bad debt reserve, is management's best guess as to how many accounts receivable customers will not pay.
You must include the cost of creating an allowance for doubtful accounts on your company's balance sheet. Record it as an expense on your income statement if the dubious debt ultimately turns out to be a bad debt.
Contra assets, as opposed to the part on current assets, is where allowance for dubious accounts belongs. The balance of a contra-asset account will either be zero or negative.
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