Which competency is focused on adhering to health and safety regulations within the workplace?

The focus on adhering to health and safety regulations within the workplace is best represented by practicing good housekeeping. This competency involves keeping the workspace clean and organized, which minimizes the risk of accidents and promotes a safe environment for both staff and patients. Good housekeeping practices include proper storage of pharmaceutical products, maintaining clear walkways, and ensuring that hazardous materials are handled and disposed of correctly. By adhering to these practices, a pharmacy assistant helps to create a safer workplace, which is crucial in any health-related setting.

In contrast, the other options, while important in their own right, do not directly address health and safety regulations. Monitoring supply and inventory pertains more to operational efficiency rather than workplace safety. Using pharmaceutical calculation techniques and terminologies relates to the accuracy of medication dispensing rather than safety protocols. Performing computer operations can enhance workflow and efficiency, but it doesn't inherently involve compliance with health and safety regulations. Thus, good housekeeping stands out as the competency that specifically aligns with promoting a safe workplace.