What is a primary Actor in a Use

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What is a primary Actor in a Use-Case?

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• ) What is a primary Actor in a Use-Case? How is
  it drawn in the diagram? How
• is that same actor represented in the DFD
  diagram? 2) What is the relationship between
  level 0 and level 1 DFD diagrams? 2 points
• Cite steps in Building DFDs hierarchy 3 points
  3) Suppose you are in the process of drawing the
  DFDs, and you have found that
• one of your Level 1 DFD describing a process in
  level 0, has more than 8 subprocesses. What does
  that indicate? And How do you fix it? 4) Read the
  following case study description and answer the
  questions given

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