Organization ABC is considering using cloud services during peak periods. Because they want to be in control of the infrastructure and their data, they are opting to use their on$-$premises resources for business, but at the same time they want to be able to upload important documents to a central archive during peak periods. The program used for uploading rejects any uploads when operating at full capacity. ABC would want to use a cloud computing architecture that would enable them to meet the spikes in demand.

a$.$Which cloud computing architectural model can they employ? Justify your choice.