Positive usability findings play a key role in reinforcing what is working well in the user interface. They help:

A: Build developer confidence and soften criticism when pointing out issues.

C: Provide a complete picture of usability strengths and weaknesses.

D: Inform developers what should remain unchanged during redesign.

However, B is incorrect because justifying usability test costs should not rely solely on positive findings. Cost justification should come from the overall impact of usability on user satisfaction, performance, and business outcomes—not just good results.