Final answer:
In the context of IaaS, offering non-standard machine instances to customers is impractical because it would complicate management, result in unpredictable costs, and create inefficiencies. IaaS is designed for standardized instances to provide clear, scalable, and efficient options for customers. Option D is correct.
Step-by-step explanation:
From the standpoint of Infrastructure as a Service (IaaS), it makes no sense to offer non-standard machine instances to customers. IaaS providers, such as Amazon Web Services (AWS), Cloud Platform (GCP), and Microsoft Azure, typically offer a menu of pre-configured virtual machine (VM) instances that vary by CPU, memory, storage, and network capabilities.
These pre-configured instances are standardized to optimize for efficient resource utilization, cost predictability, and to streamline operational management for both the provider and the customer.
Offering non-standard instances would complicate the provider's data center management, result in unpredictable costs for the customer, and generally create inefficiencies.
Standardized instances also benefit customers by providing clear options which can be easily compared and scaled according to their needs. Non-standard machine instances may be difficult to manage and could be less reliable, thus negating the benefits that typically draw users to IaaS solutions in the first place.