2021-031

Choose the incorrect alternative below:

1. The Initial Attractiveness model addresses an issue with the Barabási-Albert model, namely, that an isolated node cannot acquire links, by adding a constant to the preferential attachment function.  Instead of just \( k \), we now have \( k + A \).
2. The Internal Links model addresses an issue with the Barabási-Albert model, namely, to add new links among preexisting nodes, and not only among the new node and former nodes.
3. The Accelerated Growth model adds new nodes and links.  The number of links to add is not a constant, but grows over time.
4. In real networks, nodes and links can disappear. The Node Deletion model only removes nodes, and does not add new nodes. Nodes are removed based on a rate \( r \). Depending on \( r \) being positive or negative, more or less nodes are removed.
5. E. None of the above

Original idea by: Mauricio Schiezaro