1. Hover event
  2. Focus event
  3. Click event
  4. Blur event

Answer: 4) <Blur event>

Explain :- The Blur event occurs when the element loses focus, which happens when a user clicks or tabs out of an input field. It can be used to validate user input, update data, or trigger a function when a user leaves an input field. The Focus event, on the other hand, is triggered when an element receives focus. The Click event is triggered when a user clicks on an element, while the Hover event is triggered when a user hovers over an element with their mouse.
Therefore, the correct answer is option 4 - "Blur" event.