The ignore_user_abort( ) function sets whether a client disconnect should abort a script execution. In what scenario would you, as a web developer, use this function?

You would use it to stop a user from clicking the back button if they decide not to view as a result of a click.
You would use this function if you have some important processing to do and you do not want to stop it, even if your users click Cancel.
You would use this function if you wanted to abort the script for all logged-in users, not just the one who disconnected.
You would use this function if you want a PHP script to run forever.