Which of the following actions would violate body art health regulations?

Continuing operations after a Cease and Desist Order is a clear violation of body art health regulations because such orders are legally binding directives issued by health authorities to halt operations due to identified health risks or non-compliance with regulations. These orders are put in place to protect public health and safety; therefore, disregarding them poses a significant risk not only to clients but also to the professional's practice and potential legal standing.

In contrast, the other actions listed—using sterilized equipment for tattoos, asking clients about their health history, and providing clear aftercare instructions—are all practices that promote safety and health compliance. Utilizing sterilized tools ensures that the risk of infection is minimized, inquiring about a client's health history helps to identify any potential contraindications for body art procedures, and giving aftercare instructions is essential for preventing complications and ensuring proper healing. Together, these practices reflect adherence to health regulations and foster a safer environment for clients.