Which of the following is a true statement concerning that auditor's report on comparative financial statements?

a.

a continuing auditor may under certain circumstances express an opinion different from the previous opinion.

b.

the report should not express an opinion different from that previously expressed on the statements of a prior period because the differences would lessen the public's confidence in the integrity of the auditor's report.

c.

a predecessor auditor may reissue the report on the financial statements of a prior period provided (s)he performs certain procedures, including obtaining a letter of representations form the successor auditor, and provided (s)he refers in the reissued report to the work of the successor auditor.

d.

if the financial statements of the prior period have been audited, but those of the current period have not, the auditor should update the report on the prior period and include as a separate paragraph in the report a disclaimer of opinion on the unaudited financial statements.