Which of the following is NOT one of the four speed settings?

The four speed settings commonly used in various engineering contexts, particularly related to motors and machinery, typically include Low, Medium, and High. These settings help in adjusting the operating speed of equipment to meet specific requirements for efficiency, performance, and safety.

Dynamic, as a term, often refers to concepts relating to motion or forces in a broader context rather than a specific speed setting in machinery. It might imply responsiveness or variable performance, but it does not represent an established standard speed category. Therefore, identifying Dynamic as not being one of the four standard speed settings is based on the understanding that it does not fit within the typical nomenclature designed for operational speed classifications.