What is true about lifelines?

Question

Options

• Arepresent a sequence of operation calls
• Brepresent an individual participant in the interaction
• Chas traces of events following the sequence of messages
• Din a sequence diagram, are horizontal or with a slight downward slope

• A
  4% (2)
• B
  73% (37)
• C
  18% (9)
• D
  6% (3)

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