15. A software company needs a cloud-based environment that allows developers to write, test, and deploy applications without managing the underlying infrastructure. Which cloud service model is being used?
Answer: B
Platform as a service (PaaS)
The cloud service model being used is Platform as a Service (PaaS), as it provides a cloud-based environment for developers to write, test, and deploy applications without the need to manage the underlying infrastructure.
A) Software as a service (SaaS)
Software as a Service (SaaS) delivers software applications over the internet, allowing users to access software without installing it on local devices. While it offers a complete software solution, it does not provide the underlying platform for development and deployment, making it incorrect for the scenario described.
B) Platform as a service (PaaS)
Platform as a Service (PaaS) is the correct answer because it provides a comprehensive platform that includes the hardware and software tools necessary for developers to build, test, and deploy applications. This model abstracts the infrastructure layer, allowing developers to focus on application development without worrying about server management, thus fitting the requirements stated in the question.
C) Public cloud
Public cloud refers to cloud services offered over the public internet, which can include various service models like SaaS, PaaS, and IaaS. However, the term 'public cloud' does not specify the type of service model being utilized, making it too broad and not the correct answer for the specific needs outlined in the question.
D) Infrastructure as a service (IaaS)
Infrastructure as a Service (IaaS) provides virtualized computing resources over the internet. While it allows for extensive control over the infrastructure, it requires users to manage operating systems, applications, and storage, which contradicts the need for a managed environment for developers as stated in the question.
Conclusion
Platform as a Service (PaaS) is definitively the correct choice as it meets the requirement of providing a managed cloud-based environment for application development and deployment. In contrast, the other options either do not offer the necessary tools and management or are too broad to satisfy the specific context of the question.