What is an essential function of HFD Staff Services?

B is the correct answer because investigating complaints is a crucial function of the HFD Staff Services. This function helps ensure accountability and transparency within the department, allowing for a systematic approach to addressing issues that may arise from public interactions or internal operations. By investigating complaints, Staff Services can identify areas for improvement, reinforce standards of conduct, and enhance community trust in the fire department.

The other functions, while important, do not align as closely with the primary responsibilities of Staff Services. Providing firefighting equipment, conducting training, and managing public relations are functions typically associated with operational units or specific divisions within the department rather than the overarching role of Staff Services.