Final answer:
To distribute an app directly to the user via email or website, you must have the user's permission and the APK file of the app. The correct answer is A. the user's permission. andD. the APK file of the app.
Step-by-step explanation:
In order to distribute an app directly to the user via email or website, you must have the user's permission.
This is because distributing an app without the user's permission would be a violation of their privacy and potentially illegal.
A signed contract with the user is not necessary, but it may be advisable in some cases for legal purposes.
The app does not need to be publicly available on the app store, as email or website distribution can be done independently.
Finally, to distribute the app, you would need the APK file of the app, which is the installation file for Android devices.
Therefore, the correct answer is A. the user's permission. andD. the APK file of the app.