If a modification through renovation occurs, what happens to the sequence number?

• A. The sequence number remains the same
• B. A new digit is appended to the sequence number
• C. The interfix number shifts
• D. A letter is added to the sequence number

Answer: (D)

Renovation modifications are treated as an update to an existing change rather than a brand-new numeric entry. To keep the original modification identifiable and maintain a clear history, a suffix letter is added to the existing sequence number. This signals that the same modification family has been revised through renovation while preserving the numeric part for traceability. For example, the sequence number remains the same base, but a letter is appended to indicate the renovation version.

The other options would disrupt traceability: leaving the number unchanged would obscure that a renovation occurred, adding a new digit creates a separate, new modification without showing its connection to the original, and shifting the interfix would alter the structure of the identifier in a way that doesn't reflect a renovation update.