Which one of the following words/phrases is most appropriately used to denote “an interoperable network of 3D virtual worlds that can be accessed simultaneously by millions of users, who can exert property rights over virtual items"?

Metaverse: This term accurately describes a network of interconnected, persistent 3D virtual spaces.  Key characteristics of the metaverse often include: * Interoperability: Users can move between different virtual worlds seamlessly. * User-Generated Content: Users can create, own, and trade virtual assets. * Social Interaction: The metaverse facilitates social experiences and interactions. _Let's look at why the other options are incorrect:_ * Big data analytics: This involves analyzing large and complex datasets to uncover patterns and insights. It's not directly related to virtual worlds. * Cryptography: This focuses on secure communication and data protection techniques. While relevant to security within a metaverse, it doesn't define the concept itself. * Virtual matrix: This term is not commonly used to describe the concept outlined in the question. The term 'matrix' is often associated with a grid-like structure or a virtual reality environment, but not the broader interconnected network the question describes.