Which security framework focuses on IT core operational processes including capacity and availability management?

The correct answer is ITIL, or the Information Technology Infrastructure Library. This framework is specifically designed to improve IT service management (ITSM) across an organization. One of its primary focuses is on core operational processes, which includes pivotal aspects such as capacity management and availability management.

Capacity management is crucial because it ensures that the IT infrastructure is provided at the right time in the right volume, ensuring that services are available to meet user demands. Availability management, on the other hand, focuses on ensuring that IT services are always available to users and that any disruptions are minimized.

ITIL provides a structured approach for managing these processes, offering best practices and guidelines that can be adapted to various organizational needs. This holistic methodology allows organizations to optimize their IT services and align them more closely with business objectives, enhancing overall performance and user satisfaction.

While the other frameworks listed have their merits, they do not focus specifically on the core operational processes associated with IT service management in the way that ITIL does.