Which of the following types of social responsibilities is voluntary and guided purely by the organization's desire to make social contributions?

An internal auditor in a small broadcasting organization was assigned to review the revenue collection process.
The auditor discovered that some checks from three customers were never recorded in the organization's financial records. Which of the following documents would be the least useful for the auditor to verify the finding?

Which of the following is an example of a transaction-level control?

According to IIA guidance, which of the following are considerations of due professional care when an internal auditor conducts a formal consulting engagement?
1. The complexity of the work required.
2. The needs and expectations of the client.
3. The potential value of the engagement compared to the effort.
4. Information regarding assumptions and procedures to be employed.

Which of the following control methods is effective in reducing the risk of purchasing-scheme fraud?
1. Periodically reviewing the vendor list for unusual vendors and addresses.
2. Segregating duties for amount purchasing, receiving, shipping, and accounting.
3. Validating sequential integrity of purchase orders.
4. Verifying the validity of invoices with post office box addresses.