Which of the following statements is correct regarding the responsibility of signing officers (usually the CEO and CFO) of public companies under the Sarbanes-Oxley Act of 2002?

a. The external auditor will certify in quarterly and annual reports filed with the SEC that the report does not contain untrue statements of material facts and that the financial statements and disclosures present fairly (in all material respects) the financial condition and results of operations of the issuer. 

b. The external auditor must establish and maintain effective internal controls to ensure reliable financial statements and disclosures. 

c. The external auditor is responsible for designing internal controls, assessing their effectiveness, and disclosing material deficiencies in controls to the audit committee and to the registered accounting firm. 

d. All of the above are correct. 

e. None of the above are correct.