I'll give you a question, please answer with step-by-step reasoning process. Finding information in an old library requires what in a card catalog?
Options:
- chewing
- searching for
- ask questions
- logic
- time

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Old liabraries used to use the card catalog. A catalog card is an individual entry in a library catalog containing bibliographic information. Old library requires searching for card catalog to find the information.
The answer: searching for.