Refer to Ridgley, Cooper, and Ross. Which of the following represents a key component of the Sarbanes-Oxley Act relating to consulting services?

a.	A public corporation must change its lead consulting firm every five years.
b.	Accounting firms are prohibited from providing many types of consulting services to the companies they audit.
c.	Accounting firms who report violations of the Sarbanes-Oxley Act must be banned from consulting for five years.
d.	The SEC is required to establish a full-time five-member federal oversight board that will police the consulting industry.
e.	Consultants must maintain financial documents and audit work papers for fifteen years.