According to TOGAF, which one of the following best describes an enterprise architecture?

While enterprise architecture is frequently applied to commercial organizations, its definition is broader and encompasses government or non-profit entities as well.

Enterprise architecture can include multiple subsidiary companies, but this is a characteristic of its scope, not its fundamental definition as an architecture crossing systems and functional groups.

TOGAF defines enterprise architecture as the master plan for an enterprise, integrating business processes, information systems, and technology infrastructure to achieve strategic goals. This holistic view necessitates crossing multiple systems and functional groups within the organization.

Enterprise architecture represents the highest level of architectural scope within an organization, but 'highest level of architecture that can be achieved' is less precise than describing what it actually encompasses.