Assume !p denotes sending of p, ?p the reception of p. In the exhibit, what traces are valid? (Choose three)

Question

Options

• A<p, !p, ?r, ?r, !r, !q, ?q>
• B<p, ?p, !q, ?q>
• C<p, !p, !r, ?r, !q, ?q>
• D<p, !p, ?r, !r, !q, ?q>
• E<p, !p, ?r, !r, !q, ?r, ?q>
• F<p, !p, ?r, ?p, !r, !q, ?r, ?q>

• A
  70% (14)
• B
  5% (1)
• E
  15% (3)
• F
  10% (2)

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