Definition: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
Input: [header] How to create a recovery disc in windows 7 [title] Understand what this disc does. [step] In order to create an installation disc, you'll need your windows 7 product key. If you purchased a prebuilt computer or laptop, you can usually find the product key printed on a sticker affixed to the bottom of your laptop or on the back of your tower. <sep> (A) [substeps] You can find the product key on one of the top-right corner corners of the windows desktop or in the center of the left section of the dashboard. You can see the product key under the " appearance " panel; click on it. (B) It may be included with your computer's documentation. If you purchased windows 7 from a store, the key will be in the dvd case or in your confirmation email. (C) [substeps] The letter " a " may be a different combination from the other two codes. For example, " close " may mean " deactivate " and " go " may mean " close. (D) The product key is used to partition the disc. [title] After you've obtained this key, it takes your computer a few minutes to install the disc.
Output:
B