What is a server's legal obligation?

Question: What is a server's legal obligation?
  use force to stop an intoxicated person from driving away
  provide free food and coffee to intoxicated patrons to help them sober up
  personally intervene in a situation where there is a potential for violence
  ensure that guests leaving the establishment will not cause harm to themselves or others

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ensure that guests leaving the establishment will not cause harm to themselves or others