Detailed Instructions: In this task, we ask you to write an answer to a question about when an event happened. For example, "going to school" usually happens during the day (not at 2 A.M). Note that a lot of the questions could have more than one correct answer. We only need a single most-likely answer. Please try to keep your "answer" as simple as possible. Concise and simple "answer" is preferred over those complex and verbose ones.
Q: Sentence: The origin of the funds remains unknown, although we have a general idea of how al Qaeda financed itself during the period leading up to 9/11. 
Question: When did they gain a general idea of how al Qaeda  was financing itself?
A:
after 9 / 11.