The correct answer is: C. management center.
A management center is a centralized location where data from various sources is collected, analyzed, and used to make decisions about how to improve the city’s operations. It is the core element of architecture of smart city because it provides a single point of access to data and information, and it allows for the integration of different systems and applications.
A mobile unified service is a service that provides access to a variety of city services through a mobile device. It can include services such as parking, public transportation, and waste management.
An urban application platform is a platform that provides a framework for developing and deploying urban applications. It can include services such as data management, security, and user authentication.
An integrated information provider is a provider of information about a city. It can include information about city services, events, and attractions.
Each of these elements is important for the development of a smart city, but the management center is the core element because it provides the foundation for the integration of all of the other elements.