Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to create a book with book creator [title] Download the app from the itunes store. [step] If you're on your ipad or iphone, download the app from its itunes store, or from the app store. [title] Open book creator once it has installed.

Ending1: [step] You can do this from the bottom-right. [title] Tap the book creator app (the " s " in the app store). Ending2: [step] To launch a book creator application, double-click the app icon on your device to open. [title] Understand that the installation process can take hours or even days, depending on the device's operating system. Ending3: [step] Go through the short tutorial it offers. This will give you a feel of what creating a book will be like. Ending4: [step] Tap the app to start using it. [title] Create a new comic book about the book creator you have in mind.

Answer format: ending1/ending2/ending3/ending4