In which of the following instances would the independence of the CPA not be considered to be impaired? The CPA has been retained as the auditor of a brokerage firm
a. Which owes the CPA audit fees for more than one year.
b. In which the CPA has a large active margin account.
c. In which the CPA's brother is the controller.
d. Which owes the CPA audit fees for services in the current year and has just filed a petition for bankruptcy.