Which of the following version numbers is used by TOGAF as a convention to denote a high-level outline of an architecture?

In TOGAF, a high-level outline of an architecture is denoted by Version 0.1. This designation indicates an early draft or preliminary version of the architecture, where the ideas and structure are still being shaped. The “0.1” versioning reflects that it is an initial stage, allowing for feedback and iterations before moving to higher versions that imply more refined and finalized architecture content.

This approach to versioning helps in organizing the development process, demonstrating to stakeholders that the architecture is still under consideration and subject to changes. A high-level outline at this stage would typically have sufficient detail to convey the main components and relationships but leave much open for further development—making it clear that it is not yet a complete or final architecture. The other version numbers either indicate more finalized stages or are not in line with TOGAF's versioning conventions for high-level outlines.