California Registered Dental Assistant (RDA) Written Practice Exam

The assistant is positioned 4-6 inches higher than the operator in order to maintain a clear line of sight and provide better support and assistance during procedures. Option A is incorrect because being directly opposite to the operator could obstruct their view and potentially create obstacles in their work. Option C is incorrect because being at the same height as the operator could lead to difficulties in reaching equipment and instruments. Lastly, option D is incorrect because being 4-6 inches lower than the operator could cause strain on the assistant's neck and back.