What method do you need to invoke inside a View Rendering form to ensure only its controller reacts to the post?

The method that needs to be invoked inside a View Rendering form to ensure that only its controller reacts to the post is Html.Sitecore().FormHandler(). This method is specifically designed to handle form submissions within Sitecore's MVC architecture by linking the form to the appropriate rendering and controller. When you use this method, it ensures that the form data is correctly posted to the intended Sitecore controller, allowing for seamless integration between the view and its corresponding logic.

Using this method streamlines the process of handling form submissions, as it automatically manages the routing to the appropriate controller action. This is especially important in Sitecore, where multiple controllers might exist, and you want to avoid unintended handling of form data by other controllers.

The other options do not serve the same purpose. For instance, Sitecore.Mvc.Presentation.Controller() refers to the base class for all Sitecore MVC controllers, while Html.BeginForm() is a standard HTML helper for creating forms but does not inherently bind the form to Sitecore's handling mechanism. Lastly, Sitecore.Web.UI.Controls.Button() is not relevant in the context of form handling directly, as it pertains more to button UI control rather than form submission management. Thus, the choice of `Html.Sitecore