The correct answer is: B. pervasive computing.
Pervasive computing is a type of computing that is embedded in the environment and is typically not mobile. It is often used to provide information and services to users without them having to carry around a separate device. Some examples of pervasive computing include smart homes, smart cities, and wearable devices.
Mobile portals are websites or applications that are designed to be accessed on mobile devices. They typically provide a simplified version of the website or application that is optimized for mobile devices.
Context-aware computing is a type of computing that is aware of the user’s context, such as their location, time of day, and current activity. It can be used to provide personalized information and services to users.
Voice portals are devices that allow users to interact with computers using their voice. They are often used to control smart home devices or to access information and services.