Question: How would you fire a callback when any AJAX request on a page has completed?

1. `$('body').ajaxComplete(function() { console.count('An AJAX request completed'); });`
2. `$(document).on('ajax-complete', function() { console.count('An AJAX request completed'); });`
3. `$('body').on('ajaxComplete', function() { console.count('An AJAX request completed'); });`
4. `$(document).ajaxComplete(function() { console.count('An AJAX request completed'); });`

Answer: The correct answer of the above question is Option D:`$(document).ajaxComplete(function() { console.count('An AJAX request completed'); });`