A forest in Active Directory is:

• A. A collection of one or more Domain Trees that share a common logical structure and directory schema
• B. A single domain with no trees
• C. A group of user accounts
• D. A set of OU containers

Answer: (C)

In Active Directory, a forest is the top-level boundary that can contain one or more domain trees. Those trees share a common schema and configuration, and they also rely on a global catalog that supports forest-wide searches and cross-domain access. This structure enables trust and seamless interaction across all domains within the forest. So the best description is that a forest is a collection of domain trees that share a common schema, configuration, and global catalog. The other ideas describe different AD components—a single domain without trees, a group of user accounts, or a set of organizational units—rather than the forest as a whole.