What are the characteristics of the process of documenting the layers of an existing network? （）
- A begins with gathering organizational input that may be inaccurate
- B begins with gathering organizational input that does not need to be supplemented by a network audit
- C requires a network audit to support some upgrade decisions
- D requires a network audit to support any network restructuring
- E provides reliable input for verifying network consistency
- F does not provide reliable input for designing change