The vector of sequence numbers for the only multicast that P0 sends out, as a comma...
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Problem
The vector of sequence numbers for the only multicast that P0 sends out, as a comma-separated list (without the brackets).
Step-by-step solution
P0 sends out only one multicast, M5. The sequence number for this multicast is (0,0,0,0) as it is the first message sent by P0 and all sequence numbers start with zeros.
Answer
0,0,0,0