Which behavior indicates that a client understands the correct technique for administering insulin?

The behavior that indicates a client understands the correct technique for administering insulin is the action of properly disposing of the needle in an appropriate container after use. Safe disposal of needles is crucial in preventing injuries and infections, thereby demonstrating a responsible and knowledgeable approach to insulin administration. This behavior reflects an understanding of the importance of safety and hygiene in the process, which is essential for anyone using injectable medications.

Injecting insulin primarily into the abdomen is not the only correct technique, as other sites such as the thigh, upper arm, and buttocks can also be used depending on the individual's needs. While rotating injection sites is important to prevent lipodystrophy, using the same site every time does not show a proper technique and can be detrimental to the skin over time. Additionally, while holding the needle at a 90-degree angle is sometimes appropriate for certain body types and injection sites, it's not universally recommended, as some may need to use a different angle. Thus, the focus on proper disposal of the needle most clearly demonstrates a complete understanding of safe insulin administration practices.