please answer these questions in one page length for Informations system E-commerce class
1.Define SaaS, PaaS, and IaaS.
2. Compare and contrast SaaS, PaaS, and IaaS technology concepts.
3. Select one vendor/firm/platform example for each: SaaS, PaaS, and IaaS providers and provide a brief description of each firm’s core competency.
4. Explain how you classified the firms you selected as SaaS, PaaS, and IaaS.
5. Your submission should be no more than 1 page in length.