Final answer:
The location of boarding announcements in a manual would be found through the table of contents or index of that specific manual. All of the given options are incorrect.
Step-by-step explanation:
The location of boarding announcements in a manual will depend on the structure and organization of that specific manual.
Manuals are typically divided into sections, often labeled as Section A, Section B, Section C, etc., or with similar labels. Each section contains specific information.
If the manual in question has a table of contents or an index, the best way to find where boarding announcements are located is to consult these aids.