How many times can a user be asked for push permission?

A user can be asked for push notifications permission only once per application install on iOS. This is by design to enhance user experience and reduce the frustration that may come from repeated requests. When an app first requests permission for push notifications, the system prompts the user with a dialog box. If the user declines the request or grants it, the app will not prompt them again unless the app is uninstalled and then reinstalled.

This single prompt approach is crucial as it encourages developers to be strategic about when and how they ask for permission, ensuring that users are not overwhelmed with requests from apps. Therefore, the correct answer reflects this guideline established by Apple for user permissions regarding push notifications.