Which of the following describes a use case for Amazon VPC?

The use case for Amazon Virtual Private Cloud (VPC) is primarily focused on isolating resources to improve security. A VPC allows users to create a logically isolated section of the AWS cloud where they can define and control a virtual network. This network provides robust security features that permit users to restrict access to resources, configure firewall settings, and establish private and public subnets.

By isolating resources within a VPC, organizations can enforce security policies and ensure that sensitive information and critical workloads are protected from unauthorized access. VPC also allows users to set up security groups and network access control lists (ACLs) to manage both inbound and outbound traffic. This capability is crucial for compliance with security standards and for safeguarding data.

The other options reflect different capabilities or features of AWS services but do not align with the primary purpose of Amazon VPC. For example, enhancing machine learning model accuracy pertains more to data processing and algorithm optimization rather than network isolation. Managing server load is associated with load balancing services, and optimizing storage costs relates more to AWS storage solutions rather than a VPC's network capabilities.