(Quiz week 11, nov 10th) The 3 layouts bellow show the distribution of 5 containers with inflamable substance distributed on a chemical floor. So, it's important trying to find the most safe distribution of the containers in order to prevent a catastrofical event on which a container explode and the explosion propagates to other(s) container(s) nearby. To analyse an eventual cascading failure through the networks represented by the containers distributions, consider the Failure Propagation Model. Also, consider breakdown treshold $\varphi = 0.4$ for all nodes.

                                       

Distribution 1

Distribution 2

Distribution 3

For each distribution, consider the 5 scenarios, where a failure initiates at node A, B, C, D and E, respectively. Is correct to state that:

1. If initial failure occurs at node A, all 3 distributions propagates failures to neighbors nodes.
2. If initial failure occurs at node D, all 3 distributions propagates failures to neighbors nodes.
3. Initial failure at node C on distribution 1 doesn't trigger an avalanche cascade effect.
4. Initial failure at node B on distribution 3 doesn't trigger an avalanche cascade effect
5. None of the above

Original idea by: Fábio Assunção.