What does a product specification primarily describe?

A product specification primarily describes the critical aspects, requirements, and characteristics of a product, so option A is correct. It provides a formal reference that explains what the product must include, how it should perform, and what constraints or acceptance criteria apply. This helps create shared understanding among designers, developers, testers, managers, and other stakeholders. Option B describes a prototype, which is an early version used for exploration and validation. Option C refers more to resilience, reliability, or continuity rather than specification. Option D describes continuous integration practices in software delivery. In ITIL, the product specification is a key design artifact because it supports consistency through later lifecycle activities such as build, transition, operation, and improvement. It helps ensure that what is developed aligns with stakeholder needs.