Final answer:
The vector of sequence numbers for the only multicast that P₀ sends out is c) 2, 4, 1, 3.
Step-by-step explanation:
The vector of sequence numbers for the only multicast that P₀ sends out is c) 2, 4, 1, 3.
To determine the vector of sequence numbers, we look at the options and select the one that matches the given sequence. The sequence starts with 2, followed by 4, then 1, and finally 3. Therefore, option c) 2, 4, 1, 3 is the correct answer.