Which of the following presents the GREATEST challenge for a large-scale enterprise when procuring Infrastructure as a Service (IaaS)?

Testing vendor resiliency plans is a crucial activity but is part of *ensuring* the vendor meets requirements, not the overarching greatest challenge itself.

While labor liability is a concern in any outsourcing, IaaS primarily deals with infrastructure, and direct labor liability is less prominent than in other service models like PaaS or SaaS with more managed services.

Large enterprises often have complex, stringent, and numerous corporate requirements, including regulatory compliance, specific security standards, data residency, performance SLAs, integration needs with existing on-premise systems, and custom configurations. Ensuring an IaaS vendor can fully meet and sustain all these diverse and often unique requirements across the enterprise presents a significant challenge.

Monitoring KPIs is an ongoing operational task and a means of verifying service levels, but the initial and continuous challenge is defining and ensuring the vendor can *meet* those KPIs derived from corporate requirements.