The correct answer is: B. mobile enterprise.
A mobile enterprise is a business that uses mobile computing to improve communication and collaboration among employees. Mobile enterprises use a variety of mobile devices, such as smartphones, tablets, and laptops, to access business applications and data. This allows employees to work from anywhere, at any time, and to be more productive.
A sensor network is a group of interconnected sensors that collect data from the environment. Sensor networks are used in a variety of applications, such as environmental monitoring, industrial control, and home automation.
A voice portal is a computer system that allows users to interact with it using voice commands. Voice portals are used in a variety of applications, such as telephone answering systems, voice-activated assistants, and online shopping.
A mobile portal is a website or application that is designed to be accessed from a mobile device. Mobile portals typically provide access to a variety of services, such as email, news, weather, and maps.