Which of the following is NOT one of the four major staff functions in a full-service advertising agency?

Name: Which of the following is NOT one of the four major staff functions in a full-service advertising agency?
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Question

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Marketing research is typically a separate function or department and not considered one of the four major staff functions in a full-service advertising agency, which usually include account management, creative services, media planning, and account planning.

Which of the Following Is NOT One of the Four