Which of the following statements is correct?

Which of the following statements is correct?

a. A letter of representation is documentation of management’s acceptance of responsibility for the financial statements and is deemed to be reliable evidence.
b. A letter of representation is not deemed to be reliable evidence because of the potential incompetence of management.
c. A letter of representation is not deemed to be reliable evidence because of the lack of independence of the preparers.
d. None of the above is correct.