Which of the following is within the board's regulation capability?

The board's ability to delegate work to board staff is aligned with its regulatory capabilities. This function is essential for efficient governance and administrative operations. By delegating tasks, the board can ensure that specific duties, such as licensing, compliance checks, or public inquiries, are handled effectively by qualified personnel. This helps in maintaining the efficiency and responsiveness of the board's operations without micromanaging every detail.

In the context of the other options, setting fees for patient services is typically outside the regulatory scope of a state board and may be influenced more by market conditions and private agreements rather than established by the board. Conducting advertising campaigns is generally not a function of the board; regulations pertaining to advertising often provide guidelines to optometrists rather than involve the board directly in campaign processes. Similarly, restricting locations where optometrists can practice would likely overstep the boundaries of regulatory authority, as it may infringe on professional autonomy and the ability of practitioners to operate within reasonable geographic areas based on demand and need.

Thus, delegation of tasks to staff is the most appropriate regulatory capability of the board, ensuring it can operate effectively within its mandate.