An enterprise wants to provide low-cost delivery of network systems that can be scaled on business demand, followed by an initiative to reduce capital expenses for new IT equipment. Which technology…

IaaS within an on-premises location still requires purchasing and maintaining physical hardware, which does not reduce capital expenses.

SaaS within an on-premises location is contradictory - SaaS is delivered externally by definition, and on-premises deployments require capital investment in hardware.

IaaS within a private cloud may reduce some overhead but still requires the enterprise to own and fund the underlying physical infrastructure, preserving capital expenses.

PaaS within a public cloud shifts infrastructure costs from capital expenditure to operational expenditure because the cloud provider owns and maintains all underlying hardware. The public cloud model allows elastic scaling to match business demand without purchasing new equipment. PaaS further reduces overhead by abstracting platform management, leaving only application-level concerns to the enterprise.