Which system enables the transmission of data over public and private networks?

The telecommunication system is the correct response as it encompasses a range of technologies and infrastructure that facilitate the transmission of data across both public and private networks. This system includes various communication channels and transmission methods, such as telephone lines, satellite systems, and internet connections, allowing for effective data exchange among devices and networks. Telecommunication systems play a crucial role in modern communication, enabling not just voice calls but also data transfer for various applications, including email, video conferencing, and online collaboration.

While a data warehouse is specialized for storing and managing large quantities of data for analysis and reporting, it does not specifically indicate the mechanisms for data transmission.

File Transfer Protocol (FTP) is indeed a method used for transferring files over a network but is not a comprehensive system that describes the overall infrastructure utilized for data transmission over various types of networks.

A network firewall serves as a security measure, protecting the network by controlling incoming and outgoing traffic, but it does not facilitate the transmission of data; rather, it ensures that such transmissions occur in a secure manner.

The telecommunication system, therefore, is the most appropriate answer as it accurately represents the structure that enables data transmission across different types of networks.