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The Answer is 3

Both use server-side Java to dynamically generate web
pages. The source code to a JSP looks like HTML, with Java
embedded inside funny tags (*); the source code to a
servlet looks like Java, with HTML embedded in out.print
(…) statements. Both use the Servlet API to communicate
with the web server and the client. In fact, a JSP gets
compiled into a servlet, so they’re almost identical in
terms of expressive power. The choice is, whether you’re
more comfortable coding your pages in Java or in JSP-style
HTML
Though the both are identical, they have different roles in
the Model View Controller (MVC) architecture. View
corresponds to JSP, Controller corresponds to Servlet and
Model to BusinessLogic + Database

This relates to stateful DOM components (form elements) and the difference:

• A Controlled Component is one that takes its current value through props and notifies changes through callbacks like onChange. A parent component “controls” it by handling the callback and managing its own state and passing the new values as props to the controlled component. You could also call this a “dumb component”.
• A Uncontrolled Component is one that stores its own state internally, and you query the DOM using a ref to find its current value when you need it. This is a bit more like traditional HTML.

In most (or all) cases we should use controlled components.