The correct answer is C. WiMAX.
WiMAX (Worldwide Interoperability for Microwave Access) is a wireless broadband technology designed to provide Internet access across metro areas to fixed (not moving) users. It is a standard that specifies how wireless devices communicate with each other over long distances. WiMAX is often used to provide high-speed Internet access to businesses and homes in areas where cable or DSL service is not available.
A voice portal is a website or application that allows users to make and receive phone calls using their computer or mobile device. Voice portals are often used by businesses to provide customer service or support.
A mobile portal is a website or application that is designed to be accessed on a mobile device, such as a smartphone or tablet. Mobile portals often include features such as news, weather, sports, and social networking.
Geolocation is the process of determining the geographic location of an object. Geolocation can be used for a variety of purposes, such as tracking the movement of people or vehicles, or providing location-based services.