2021-037

The values of $⟨k⟩$ for a network to have a critical threshold $f_c>0$ are:

1. $⟨k⟩>2$ for any random network and $⟨k⟩>1$ for any other
2. $⟨k⟩>1$ for any network
3. $⟨k⟩>2$ for any network
4. $⟨k⟩>1$ for any random network and $⟨k⟩>2$ for any other
5. None of the above

Original idea by Thales Nazatto