Which of the following are auditors of public companies not required to report in writing to those charged with governance?

Group of answer choices:

a. There was an immaterial misstatement detected by the auditor that the client chose not to correct.

b. There was a material weakness in the clients inventory controls.

c. There were several immaterial misstatements detected by the auditor that the client chose to correct.

d. There was a significant deficiency in the clients revenue recognition controls.