Problem: Suppose that an auditor intends to send confirmations to a random sample of 10 accounts receivable. The auditor then identifies the accounts with 10 largest balances and sends confirmations to the customers who owe those amounts according to the audit client's records. Only 6 of the 10 confirmations come back confirming those 6 balances. After sending repeated confirmations to the 4 other customers the auditor does not receive a response. Still the auditor concludes that the accounts receivable are not materially misstated. Which of the following biases likely impacted auditor's judgment in this case? Group of answer choices Bias in sample selection Nonresponse bias A & B None of these