Which of the following statements about the IRS audit process is true? The IRS collects about 10% of its audit revenue from auditing very large corporations. O Correspondence (service center) audits are usually triggered by high DIF scores. An office audit will normally involve a review of taxpayer's entire return. An audit under the IRS' program for very large corporations is usually done by one (possibly two) of their most experienced agents. None of the above statements are true.