What standard do virtual reality applications for the Web primarily use?

Virtual reality applications for the Web primarily use VRML, which stands for Virtual Reality Modeling Language. VRML is a standard file format for representing 3D interactive graphics on the internet. It enables the creation of interactive 3D environments that can be rendered in web browsers equipped with VRML plugins. This standard allows users to experience immersive environments and manipulate 3D objects in real-time, making it highly suitable for virtual reality applications.

By utilizing VRML, developers can create rich user experiences that include various elements of multimedia, which is crucial for effective virtual reality interaction. While other options may be related to aspects of network communication or design methodologies, VRML specifically pertains to the modeling and representation of 3D environments within web applications, which is why it is the recognized standard for this purpose.