A company is evaluating cloud providers to reduce the cost of its internal IT operations. The company's aging systems are unable to keep up with customer demand. Which of the following cloud models…

Platform as a Service (PaaS) provides a complete development and deployment environment, which is suitable for building and running new cloud-native applications but not typically the primary choice for migrating existing 'aging systems' without significant re-architecture.

Software as a Service (SaaS) offers fully managed applications directly to end-users over the internet, which would mean replacing the company's 'internal IT operations' and 'aging systems' with a pre-built third-party solution rather than migrating them.

Infrastructure as a Service (IaaS) provides virtualized computing resources such as virtual machines, storage, and networks, allowing the company to migrate its existing applications and data without managing the underlying physical infrastructure. This directly addresses the need to reduce the cost of internal IT operations (by offloading hardware management) and enable aging systems to scale to meet customer demand (by leveraging cloud elasticity).

Backend as a Service (BaaS) provides backend services for mobile and web applications (like databases, authentication, file storage) and is a specialized model for developers, not a general solution for migrating entire internal IT operations.