Staff personnel serve in a supportive or advisory capacity to the organization’s line executives. They provide specialized knowledge, consultation, and services (e.g., legal, HR, finance) without having direct authority over operations. Their role is crucial in supporting efficient decision-making and strategic planning.

CFO (A) may be a staff officer but is a specific example.

Merchandiser (B) and Retail marketer (D) are job functions, not general categories of organizational roles.