Which method is used to obtain a reference to a component on a GameObject in Unity?

In Unity, to obtain a reference to a component on a GameObject, the method used is GetComponent. This method allows you to retrieve a specific component attached to a GameObject, such as a Rigidbody, Collider, or any custom script. By calling GetComponent along with the type of component you are looking for, you can store a reference to that component and interact with it programmatically.

For instance, if you want to access the Rigidbody component of a GameObject, you would use GetComponent<Rigidbody>(). This enables you to manipulate the properties and methods of that Rigidbody, such as applying forces or changing its velocity.

The other options listed do not correspond to any existing method in Unity's API for obtaining component references. Therefore, understanding that GetComponent is the standard and essential method for this purpose is key for efficient and effective game development in Unity.