Tracings, which appear toward the bottom of a card in the library's physical card catalog or electronic record,

or the Library of Congress Cataloguing-in-Publication Data in a book itself are valuable to look at because they provide you with information on (a) other terms, besides the one you used, that the book could be found under.
(b) who has checked this book out most recently.
(c) other books by this author.
(d) All of the above

A