In Active Directory, a forest is defined as a collection of one or more trees.

• A. A collection of one or more trees
• B. A single tree that cannot be expanded
• C. An AD feature only in Enterprise Editions
• D. Active Directory is unrelated to forests

Answer: (A)

In Active Directory, the top-level boundary is the forest, which is defined by being a collection of one or more trees. A tree is a contiguous namespace of domains, and a forest can contain several of these trees. All trees within a forest share a common schema and configuration and rely on a shared global catalog, enabling seamless authentication and resource access across the entire forest. This shared structure and trust framework is what makes the forest the unifying boundary of an AD deployment.

So the statement fits exactly: a forest is a collection of one or more trees. It can be just a single tree, and it can also grow by adding more trees or domains within that forest. The other options don’t align with how AD is organized—forests aren’t limited to a single non-expandable tree, they aren’t a feature confined to Enterprise editions, and Active Directory is fundamentally tied to the concept of forests.