Choose the correct answer.
Given the following diagram:
What is the order of Interactions?
Message a1 overtakes message m1, which is processed after receipt of a1.
Message a1 overtakes messages m1 and m2 and is processed before them.
Message m1 overtakes message a1, which is processed after receipt of m2.
Message m1 overtakes messages a1 and m2 and is processed before them.
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