Final answer:
The independence restrictions under PCAOB rule 3521 mirrors those of the Public Company Accounting Oversight Board (PCAOB), which is a regulatory body established by the Sarbanes-Oxley Act of 2002.
Step-by-step explanation:
The independence restrictions under PCAOB rule 3521 mirrors those of the Public Company Accounting Oversight Board (PCAOB). The PCAOB is a regulatory body established by the Sarbanes-Oxley Act of 2002. Sarbanes-Oxley was enacted in response to major accounting scandals and aims to protect investors and increase confidence in financial information provided by public corporations.