tatement is TRUE? STAFF staff ID (pk) staff_name phone email (optional, or) HR SALES R&D HR_ focus commission_rate product_focus research_exp research area Figure (a) A. All the staffs are categorized into three subclasses. B. A HR staff cannot be a Sales staff or R&D staff at the same time. C. A staff can be a HR staff and Sales staff at the same time. D. R&D staffs will not have the basic information (i.e.: id, name, phone, and

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