Which cloud service model provides an environment for developers to build applications without managing the underlying infrastructure? 

Platform as a Service (PAAS) allows developers to build, test, and deploy applications without worrying about the underlying infrastructure (servers, storage, networking). It provides a platform that includes everything developers need (databases, development tools, operating systems), making it easier for them to focus on coding rather than hardware or software maintenance. PAAS typically provides a more abstract layer than IAAS and is often preferred for application development. Why other options are wrong: a) IAAS (Infrastructure as a Service) : IAAS provides raw computing resources like virtual machines, storage, and networking, leaving developers responsible for managing the OS and applications. b) SAAS (Software as a Service) : SAAS delivers fully developed software applications (like Google Docs) to users via the cloud, where users have no control over the infrastructure. d) FAAS (Function as a Service) : FAAS allows execution of code in response to events without managing server infrastructure, typically used for serverless computing rather than full application platforms. e) NAAS (Network as a Service) : This model provides networking services virtually, such as virtual private networks or firewalls, which is unrelated to application development environments.