Final answer:
Change Transmittals to Instructions or Notices follow the classification of the original document they modify. They do not have a separate classification or unique classification system, and they are not automatically unclassified.
Step-by-step explanation:
Change Transmittals to Instructions or Notices are documents that communicate updates or amendments to existing instructions or notices. According to standard practice, change transmittals inherit the classification of the original instruction or notice they are updating or amending. Therefore, the correct answer is:
They follow the classification of the Instruction or Notice.
This means that if the original document is classified, the change transmittal will also be classified at the same level. Conversely, if the original document is unclassified, the change transmittal will remain unclassified unless it contains new, sensitive information that warrants classification on its own.