Which of the following communication characteristics is achieved when the internal audit function avoids redundancies...

The IIA defines conciseness in audit communications as avoiding redundancy and excluding unnecessary or irrelevant details. This ensures reports remain focused, easy to read, and useful to stakeholders.

Option A (constructive) means helping to add value and improve operations. Option B (complete) refers to covering all essential issues. Option D (clear) refers to understandable language. The correct characteristic here is concise (Option C).