Hans wants to design a Web site for his site for his company, but he is not familiar with usability issues. Which advice would you give Hans regarding usability testing?

A.
Test the site when it is near production ready

B.
Use a small cross-section of testers for more accuracy

C.
Do not allow the testers to take notes because this activity will distract them

D.
Provide assistance at every step of the testing process.